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. 2016 Jun 21;7:12016. doi: 10.1038/ncomms12016

Figure 6. Distribution of cirrus optical thickness per category.

Figure 6

Frequency of observation of nCOT (a) and absolute COT (b) for all cases, with maximum cirrus geometrical depth of 2.5 km (that is, the data presented in Fig. 2). Colours refer to the different categories. Category I (magenta): inside the flight track, ahead of the aircraft. Category II (green): outside the flight track, ahead of the aircraft. Category III (blue): inside the flight track, behind the aircraft. Category IV (orange): outside the flight track, behind the aircraft.