pegasus 4dComprehensive Two-Dimensional Gas Chromatography with Time-of-Flht Mass Spectrometer. GCxGC, combined with the Pegasus HT TOFMS, changes the perspective of complex sampleThe LECO Pegasus 4D GCxGC-TOFMS system provides a snificant increase in chromatographic resolution for petroleum analyses across a wide volatility range.