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Partial modulation via a pulsed flow valve for comprehensive two-dimensional (2D) gas chromatography (GC × GC) is demonstrated, producing narrow peak widths, 2Wb, on the secondary separation dimension, 2D, coupled with short modulation periods, PM, thus producing a high peak capacity on the 2D dimension, 2nc. The GC × GC modulator is a pulse flow valve that injects a pulse of carrier gas at the specified...