pegasus 4dLECO’s GCxGC thermal modulator is the key to the enhancement of chromatographic resolution obtained by the Pegasus 4D system. The modulator, placed between the two columns,Comprehensive Two-Dimensional Gas Chromatography with Time-of-Flht Mass Spectrometer GCxGC, combined with the Pegasus HT-C TOFMS, changes the dynamic when analyzing