Fig. shows the DSP of Jet-A, terpenes, and hydrogenated terpenes. A higher DSP means a lower sooting tendency. Most of the terpenes are sootier than Jet-A (i.e., have a smaller DSP). On the other hand, some of the dihydroterpenes and all of the tetrahydroterpenes are less sooty than Jet-A (i.e., have a larger DSP), which means they would likely offer soot reduction benefits as sustainable aviation fuels.