<p><strong>Gas chromatography (GC) is a powerful analytical technique used to separate and analyze compounds in a mixture. Whether you're working in pharmaceuticals, environmental testing, or food safety, understanding the key components of a gas chromatograph is essential for accurate and efficient results.</strong></p><p>In this article, we will delve into the primary components of gas chromatography, including the injector, column, detector, and carrier gas—and explain how each plays a critical role in the separation and analysis process.</p><p>By mastering these elements, you can optimize your GC setup for precise and reliable outcomes. Let's explore each component in detail:</p><h3><strong>Sample Injector</strong></h3><p>The injector is the starting point in the <a target="_blank" rel="noopener noreferrer" href="https://www.phenomenex.com/techniques/gc"><strong>gas chromatography process</strong></a>, where the sample is introduced into the system. In GC, the sample must be vaporized into a gas before it enters the column. The injector serves this purpose by heating the sample to its gaseous state. There are many types of injectors, Split/Splitless, PTV, on column.</p><p>The most common injector is the Split/Splitless injector that can be used in split mode or in splitless mode:</p><ul><li><strong>Split Injection:</strong> This mode allows a portion of the sample to be sent to the column while the remainder is vented. It is useful for high-concentration samples to prevent system overload.</li><li><strong>Splitless Injection:</strong> In this mode, the entire sample is introduced into the column, making it ideal for trace analysis where even minute quantities need detection.</li></ul><p>Proper choice of injector type and proper control of injection conditions, such as temperature, sample size, injection mode are crucial for achieving reproducible and reliable results.</p><h3><strong>Carrier Gas</strong></h3><p>In gas chromatography, the mobile phase is represented by carrier gas, which transports the vaporized sample through the column. The carrier gas is an inert gas, such as helium, nitrogen, or hydrogen. The choice of carrier gas can influence the efficiency of the separation process.</p><ul><li><strong>Helium</strong> is the most used carrier gas due to its inertness and high flow rate.</li><li><strong>Hydrogen</strong> offers faster analysis times but requires careful handling due to its flammability.</li><li><strong>Nitrogen</strong> provides a cheaper solution compared to Helium, although it's slower than helium or hydrogen.</li></ul><p>The flow rate and pressure of the carrier gas need to be carefully controlled to ensure that the sample moves smoothly through the system and adequate efficiency is generated.</p><h3><strong>Column/Stationary Phase</strong></h3><p>The column is the heart of the gas chromatograph, where the actual separation of compounds occurs. <a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/gcms/products?category=7&amp;manufacturerItems=50"><strong>GC columns</strong></a> are typically long, thin tubes made from stainless steel or fused silica. They are coated with a stationary phase, which interacts with the components of the sample as they pass through.</p><ul><li><strong>Packed Columns:</strong> These contain small particles of stationary phase material and generally have a larger volume. While they are less efficient than capillary columns, they can be suitable for specific applications.</li><li><strong>Capillary Columns:</strong> These thin tubes are coated with a stationary phase, offering higher resolution and faster analysis times due to their smaller diameter.</li></ul><p>The length, diameter, and type of stationary phase of the column are important factors that affect the efficiency and selectivity of the separation. The choice of stationary phase (polar or non-polar; liquid-coated or solid) affects how different compounds interact with it.</p><p>As the sample moves through the column, compounds separate based on volatility and their affinity for the stationary phase, resulting in distinct peaks in the chromatogram.</p><h3><strong>Detector</strong></h3><p>Once the sample has passed through the column, it reaches the detector, where individual components are identified and measured. There are several types of detectors, each suited to different applications:</p><ul><li><span><strong>Flame Ionization Detector (FID):</strong> One of the most commonly used detectors in GC. It measures ions produced when organic compounds are burned in a hydrogen-air flame. FID is highly sensitive to a wide range of organic compounds and offers a broad linear dynamic range.</span></li><li><span><strong>Thermal Conductivity Detector (TCD):</strong> Detects changes in the thermal conductivity of the gas stream as analytes elute from the column. It is a universal, non-destructive detector, but is generally less sensitive than FID.</span></li><li><strong>Electron capture detector (ECD):</strong> A very sensitive and selective detector used to detect chlorinated compounds it is easily contaminated and requires very pure and dry carrier and makeup gases and difficult maintenance.</li><li><strong>Mass Spectrometer (MS):</strong> Provides structural information, aiding in both identification and quantification. Requires advanced and trained users and it’s difficult to maintain.</li></ul><p>The choice of detector depends on the type of analysis being performed and the sensitivity required. Each detector converts physical or chemical changes associated with the analytes into a measurable signal, producing a chromatogram that reflects concentration and retention time.</p><h3><strong>Data System</strong></h3><p>Although not a physical part of the chromatograph, the data system plays an integral role in processing and interpreting the signals generated by the detector. Modern gas chromatographs are equipped with software that converts detector signals into chromatograms—visual representations of the separation process. The software allows users to quantify and identify the components of the sample based on retention times and peak areas.</p><h3><strong>How to Read a Gas Chromatogram?</strong></h3><p>Interpreting a gas chromatogram involves understanding its essential elements, such as peaks, retention times, and the overall data for qualitative and quantitative analysis.</p><h4><strong>The Nature of the Sample</strong></h4><p>Begin by considering the sample's characteristics; different samples, such as environmental pollutants or food components, may exhibit distinct peak patterns. Recognizing the baseline (the flat line representing the signal without analytes) is crucial for identifying peaks accurately. While well-defined peaks indicate successful separation of components, poorly shaped or broad peaks may suggest issues with the separation process. For instance, if a mixture is injected and three peaks are observed, it indicates the presence of three different compounds in the sample. Conversely, when evaluating the purity of a sample, one would anticipate observing a single peak. Ideally, the chromatogram should reflect this expectation, confirming the sample's purity.</p><h4><strong>The Identity of the Sample</strong></h4><p>Retention time (Rt) is a critical factor in identifying the compounds present in the sample. Each analyte has a characteristic retention time that can be compared to known standards or literature. To confirm identities, a standard mixture should run alongside the sample; this allows to correlate retention times with specific compounds. If available, utilizing MS in conjunction with gas chromatography (GC-MS) can provide additional structural information, enhancing identification accuracy. With HR-MS or MS-MS detectors, unknown compounds can be identified by matching perfectly the Molecular weight or by matching the fragmentation pattern.</p><h4><strong>The Amount of Sample</strong></h4><p>Quantifying analytes involves analyzing peak area or height, which is directly proportional to the concentration of the analyte in the sample. A calibration curve constructed from known concentrations can help relate peak areas to actual concentrations. It is essential to consider the detector’s sensitivity and the limits of detection, as peaks below a certain threshold may not provide reliable quantification.</p>

Basic Principles of Gas Chromatography - Separation and Analysis

<p><strong>ISC 2026 officially opened in Prague on Sunday, September 6, bringing the international separation science community together at the Prague Congress Centre. The first day began with six Short Courses covering topics from analytical procedure lifecycle and mass spectral interpretation to HILIC, oligonucleotides, LC/MS data analysis, and supercritical fluids. In the afternoon, conference chairs Michal Holčapek and Lucie Nováková welcomed participants during the Opening Ceremony, followed by the J.F.K. Huber Medal Award Ceremony. The scientific program then moved into its first plenary session, spanning spintronics, single-cell proteomics and robust LC-MS, and rapid evaporative ionisation mass spectrometry. The opening day concluded with the Welcome Reception, giving participants their first opportunity to meet colleagues from around the world and begin a week of scientific exchange, new ideas, and chromatography in the heart of Prague.</strong></p><h4><strong>Sunday, September 6th</strong></h4><h5><span><strong>8:30–15:45 Short Courses 3 - 8</strong></span></h5><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Short_Courses_Koen_Sandra_176f1c6d52.jpg" alt="ISC: ISC 2026 - Day 1: Short Course SC 6 Oligonucleotides and Other Biopharmaceuticals (Koen Sandra)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Short_Courses_Koen_Sandra_176f1c6d52.jpg 235w," sizes="100vw" width="1600" height="1067"></p><h5><span><strong>16:00–16:30 Opening Ceremony</strong></span></h5><ul><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/lcms/articles?search=hol%C4%8Dapek"><span><strong>Michal Holčapek</strong></span></a><span>, Czech Republic</span></li><li><a target="_blank" rel="noopener noreferrer" href="https://labrulez.com/en-us/lcms/articles?search=Lucie+Nov%C3%A1kov%C3%A1"><span><strong>Lucie Nováková</strong></span></a><span>, Czech Republic</span></li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Opening_Novakova_and_Holcapek_bbf9dd44e3.jpg" alt="ISC: ISC 2026 - Day 1: Michal Holčapek and Lucie Nováková opened ISC 2026" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Opening_Novakova_and_Holcapek_bbf9dd44e3.jpg 235w," sizes="100vw" width="1600" height="1067"></p><h5><span><strong>16:30–17:00 Award Ceremony</strong></span></h5><ul><li>J.F.K. Huber Medal (awarded by the Austrian Society for Analytical Chemistry)</li></ul><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_JFK_Huber_Award_winner_Dave_846f6a5dff.jpg" alt="ISC: ISC 2026 - Day 1: Davy Guillarme as a 2026 recipient of the J.F.K. Lecture Award of the Austrian Society of Analytical Chemistry" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_JFK_Huber_Award_winner_Dave_846f6a5dff.jpg 235w," sizes="100vw" width="1600" height="1066"></p><h4><strong>Plenary lectures</strong></h4><h5><strong>17:00 - 17:30 Spintronics: A new paradigm in digital bits</strong></h5><ul><li>Tomáš Jungwirth, Czech Republic&nbsp;&nbsp;&nbsp;&nbsp;</li></ul><p>Besides the rapid developments in the big world of cloud data centers and AI, a remarkable paradigm shift is occurring on the level of the smallest “elementary particle” of information technologies – the single physical bit. For the first time in the history of microprocessor chips, semiconductor bits are being replaced by a fundamentally distinct technology. The technology is based on magnets and is called spintronics. All major developers and manufacturers of the advanced chip technologies are now implementing these new spintronic bits. Not across the entire microprocessor chip, but in some of its vital memory parts. The transition to the spintronic bits is happening because further miniaturization of semiconductor bits has become prohibitively expensive or even reached fundamental physical limits. In the talk we will introduce the distinct physical principle behind the spintronic bits, and highlight some of the recent adbances in spintronics research and development.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Tomas_Jungwirth_dd6eeca2b5.jpg" alt="ISC: ISC 2026 - Day 1: Spintronics: A new paradigm in digital bits (Tomáš Jungwirth, Czech Republic)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Tomas_Jungwirth_dd6eeca2b5.jpg 245w," sizes="100vw" width="1595" height="1008"></p><h5><strong>17:30 - 18:00 Single cell proteomics requires robust LC-MS: Unexpected findings bring new biological understanding</strong></h5><ul><li>Jennifer Van Eyk, USA&nbsp;&nbsp;&nbsp;&nbsp;</li></ul><p>Underlying precision medicine is the concept that an individual’s Omic signature (including the proteome) will provide a physician with clinically actionable diagnosis and a subsequent mechanistic therapeutic route that is appropriate for a particular person. This concept is based on the idea of pathological heterogeneity and recognizes the impact of differences in the heath state of individuals. The deployment of single cell technologies has demonstrated heterogeneity within a single cell type which impacts the degree of cellular heterogeneity within an organ. Unlike bulk proteomic approaches, which average signals across heterogeneous populations, single-cell proteomics captures the molecular diversity of cell. Today single-cell proteomics can provide high-resolution characterization of protein quantities and variability within the structural composition and signaling dynamics within individual cells which requires robust, precise and sensitive liquid chromatography and mass spectrometry (LC-MS) workflows with sufficient throughput to quantitatively analyze 1000s of single cells.</p><p>We have developed stable and precise single cell LC-MS workflow based on high-flow, dual trap with a single analytical column system that can achieve 96 samples per day. Furthermore, we have coupled this with a novel parallel sample preparation method on demand within the autosampler reducing sample lose and matching throughput with the LC-MS. Here, we have investigated the proteomic heterogeneity of cardiac muscle cells, cardiomyocytes, the specialized cells that contain the contractile proteins and which are responsible for the heart contraction and relaxation. By applying single-cell proteomics to cardiomyocytes isolated from human and mouse hearts, as well as human iPSC-derived cardiomyocytes, we uncovered previously unrecognized cellular subpopulations distinguished by differences in contractile and metabolic protein expression. As well unexpectedly, we unambiguously identified proteins traditionally considered absent in adult cardiomyocyte, such as slow skeletal troponin T, previously thought to be restricted to fetal or skeletal muscle or those proposed to be limited to non-cardiac cell types (e.g., neuronal proteins) or species (e.g., myosin heavy chain 7b). This suggests an unexpected fluidity in cardiac protein expression. Furthermore, single cell proteomics has provided critical insight into protein-level remodeling in heart failure, where the same single amino acid mutation in a contractile protein can give rise to diverse clinical phenotypes. At the single cell level, the mutant protein dosage in each cell drives a continuum of subproteomic pathological alterations. Only with precise protein quantification at the single cell level, is this understanding possible – all of which hinges on the LC-MS performance.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Jennifer_Van_Eyk_f8641196ff.jpg" alt="ISC: ISC 2026 - Day 1: Single cell proteomics requires robust LC-MS: Unexpected findings bring new biological understanding (Jennifer Van Eyk, USA)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Jennifer_Van_Eyk_f8641196ff.jpg 235w," sizes="100vw" width="1600" height="1066"></p><h5><strong>18:00 - 18:30 Rapid evaporative ionisation mass spectrometry: From MSI to LC-MS</strong></h5><ul><li>Zoltan Takats, United Kingdom&nbsp;&nbsp;&nbsp;&nbsp;</li></ul><p>Rapid Evaporative Ionisation Mass Spectrometry (REIMS) was originally developed for mass spectrometry-guided surgery applications, enabling the direct, real-time analysis of surgical aerosols for in-situ histological identification of tissues in cancer surgery. Coupling the technique with various surgical and non-surgical lasers led to the recognition, that the technique has comparable sensitivity to other, widely used desorption ionisation methods including DESI and MALDI. Laser Ablation REIMS using 3 μm wavelength picosecond lasers was demonstrated to provide sub-cellular resolution metabolic and lipidomic images at 2-5 μm spatial resolution, with clear visualisation of cellular nuclei. The method was subsequently used for regenerative neuroscience and cancer biology applications. The unexpectedly high sensitivity of the method (fg amounts of lipids and metabolites / pixel) encouraged us to attempt using REIMS as an LC-MS ion source. The current commercially available REIMS instrumentation utilises the so-called matrix-assited REIMS technology, involving the co-introduction of a polar solvent (water, acetonitrile or aliphatic alcohols) together with the sample aerosol. The fused droplets containing solvent and soluble components of the aerosol are introduced into the vacuum where they impact a heated (≈900 ºC) surface resulting in their 'rapid evaporation' yielding the detected ion population. In this context, the ionisation matrix was replaced by LC effluent, leading to a fundamentally new way of ionisation. The new technique termed LC-REIMS was characterised using reversed phase LC applications including lipid and metabolite profiling. The new ionisation method was found to exhibit high similarity to sonic spray and related techniques, in spite of the high temperature involved. Analytical sensitivity for complex lipids and amino acids were found to be comparable to those in ESI or APCI, albeit the relative response factors followed markedly different trends. As the technology represents an LC-MS coupling without any requirement for pressurised gas or high voltage, it has significant application potential for field instrumentation including industrial process control or security screening.</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Zoltan_Takats_3e0c11a22e.jpg" alt="ISC: ISC 2026 - Day 1: Rapid evaporative ionisation mass spectrometry: From MSI to LC-MS (Zoltan Takats, United Kingdom)" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Zoltan_Takats_3e0c11a22e.jpg 129w," sizes="100vw" width="1600" height="1933"></p><h5><span><strong>18:30–19:30 Welcome Reception</strong></span></h5><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Welcome_reception_36bfcb7276.jpg" alt="ISC: ISC 2026 - Day 1: Welcome reception" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Welcome_reception_36bfcb7276.jpg 235w," sizes="100vw" width="1600" height="1067"></p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/ISC_ISC_2026_Day_1_Welcome_reception_2_4ae69091a6.jpg" alt="ISC: ISC 2026 - Day 1: Welcome reception" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_ISC_ISC_2026_Day_1_Welcome_reception_2_4ae69091a6.jpg 235w," sizes="100vw" width="1600" height="1067"></p>

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The International Symposium on Chromatography (ISC) represents the oldest conference series focussing on separation science. ISC symposia have been organised since 1956 in each even year. ISC is internationally recognised as one of the premier meeting series for discussion of all modes of chromatography and separation science with a broad coverage of techniques and applications.

International Symposium on Chromatography - (ISC)

Mestrelab Mnova ElViS software

By integrating Mnova ElViS into your analytical workflows, you can enhance the efficiency and accuracy of your spectroscopic data analysis across a wide range of techniques.

<h4><strong>Visualize, process, analyze and report various electronic and vibrational spectroscopic techniques</strong></h4><p>Carry out the analysis of various optical spectroscopy data including ultraviolet and visible (UV/Vis), near and mid infrared (NIR/MIR), Raman, fluorescence, and other spectroscopic methods operating in the whole region of wavelength from 100 nm to 100 µm.</p><h4><strong data-start="641" data-end="654">Benefits:</strong></h4><ul><li>Spectroscopic processing and analysis of ultraviolet and visible (UV/Vis), near and mid infrared (NIR/MIR), Raman, fluorescence methods.</li><li>Vendor and Operating System agnostic, supports most data file formats.</li><li>Wide range of processing functions, including a dynamic processing template.</li><li>Manual and automatic peak picking analysis.</li><li>Data Analysis of stacked/arrayed spectra.&nbsp;</li></ul><h4><strong>Features:</strong></h4><h5><strong data-start="1039" data-end="1108">PLS-Based Baseline Correction Tool (IarPLS)</strong></h5><p>To improve the processing of electronic and vibrational spectroscopy data, Mnova 15 introduces an enhanced PLS-based baseline correction tool, IarPLS (penalized-least-squares based). It now features an automatic button to compute the near-optimal asymmetry parameter.&nbsp;</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Mestrelab_Research_Mnova_EI_Vis_PLS_Based_Baseline_Correction_Tool_Iar_PLS_f3180f6927.webp" alt="Mestrelab Research: Mnova EIVis - PLS-Based Baseline Correction Tool (IarPLS)." srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Mestrelab_Research_Mnova_EI_Vis_PLS_Based_Baseline_Correction_Tool_Iar_PLS_f3180f6927.webp 245w," sizes="100vw" width="1500" height="845"></p><h5><strong>Normalization Processing Modes</strong></h5><p>Three Normalization Processing modes, namely Largest Peak, Integral and Vector Length are available in Mnova 15. These three features aim to simplify the baseline correction process, streamline your workflow, and provide a rapid method for normalizing data to address quantitative issues.&nbsp;</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Mestrelab_Research_Mnova_EI_Vis_Normalization_Processing_Modes_675cb7c407.webp" alt="Mestrelab Research: Mnova EIVis - Normalization Processing Modes" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Mestrelab_Research_Mnova_EI_Vis_Normalization_Processing_Modes_675cb7c407.webp 245w," sizes="100vw" width="1500" height="844"></p><h5><strong>Electronic and Vibrational Spectroscopies supported file formats</strong></h5><p>Mnova ElViS supports the most frequently used data file formats for these analytical techniques, including import and export of single and multi-column matrix-like spectra (i.e., ASCII XY and XYY, as .txt or .csv files). Supported formats include SPC (Galactic), JCAMP-DX, OPUS (Bruker), SPA and SPG (Omnic), Perkin Elmer's .sp files, and ASCII (XY and XYY).</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Mestrelab_Research_Mnova_EI_Vis_Electronic_and_Vibrational_Spectroscopies_supported_file_formats_bb6afc3eab.webp" alt="Mestrelab Research: Mnova EIVis - Electronic and Vibrational Spectroscopies supported file formats" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Mestrelab_Research_Mnova_EI_Vis_Electronic_and_Vibrational_Spectroscopies_supported_file_formats_bb6afc3eab.webp 245w," sizes="100vw" width="1500" height="910"></p><h5><strong>Manual &amp; automatic spectral analysis</strong></h5><p>Mnova ElViS provides both manual and automatic peak picking, offering flexibility and convenience in your spectral analysis. It also features advanced tools for the analysis of stacked or arrayed spectra, ensuring thorough data evaluation and interpretation for all your spectral needs.&nbsp;</p><p><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Mestrelab_Research_Mnova_EI_Vis_Manual_and_automatic_spectral_analysis_e24a19a151.webp" alt="Mestrelab Research: Mnova EIVis - Manual &amp; automatic spectral analysis" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Mestrelab_Research_Mnova_EI_Vis_Manual_and_automatic_spectral_analysis_e24a19a151.webp 240w," sizes="100vw" width="940" height="611"></p><h5><strong>Main processing features</strong></h5><p>Mnova ElViS comes with a range of useful processing features, including Multiplicative Scatter Correction, Probabilistic Quotient Normalization, Baseline correction (both automatic IarPLS and tailored Multipoint Baseline Correction), several smoothing techniques (such as Savitzky-Golay, Nonlocal Means, Exponential), normalization and Standard Normal Variate (SNV), derivatives, and units conversion between absorbance and transmittance.<br><img src="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/Mestrelab_Research_Mnova_EI_Vis_Main_processing_features_bc6eb64b99.webp" alt="Mestrelab Research: Mnova EIVis - Main processing features" srcset="https://storage.googleapis.com/labrulez-bucket-strapi-h3hsga3/thumbnail_Mestrelab_Research_Mnova_EI_Vis_Main_processing_features_bc6eb64b99.webp 245w," sizes="100vw" width="1074" height="581"></p>

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