Fig. 3
From: Auroral molecular-emission effects on the atomic oxygen line at 777.4 nm
a Relationship between estimated emission intensities of OI (777.4) (IOI) and the value to be measured through the optical filter that is mounted on the EMCCD camera (Im) on the nights of (blue) October 30–31, 2016 and (orange) March 1–2, 2017. b Histogram of the emission intensity ratio (IOI/Im) on night of October 30–31, 2016. The statistical average and standard deviation are marked by a black dash and a solid line with dots, respectively. c Same as panel b, but for data from the night of March 1–2, 2017