Figure 6
From: Volatile diterpene emission by two Mediterranean Cistaceae shrubs

(a) Appearance of kaurene (12C compound and its first isotopologue) in the TOF spectra in normalized counts per second; (b) calibration of kaurene for the PTR-TOF-MS of the sum of the 12C compound and the first isotopologue in mixing ratio (ppb) against normalized counts per second; (c) the peak retention time for plant emissions (red) and standard (blue) kaurene for the TD-GC-MS (left panel), and comparison of TD-GC-MS fragmentation pattern for the plant emissions and standard of kaurene (right panel).