pegasus 4dGCxGC, combined with the Pegasus HT TOFMS, changes the perspective of complex sample analysis. No longer limited to two analytical dimensions, the Pegasus 4D GCxGC-TOFMSLECO’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,