Fig. 6
From: Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studies
Examples of fitting of Gaussian functions to azimuthally-integrated fringes obtained by (a) FP01 for 557.7 nm and (b) FP01 for 630.0 nm on January 24, 2009, at Tromsø, and (c) by FP02 for 630.0 nm on August 17, 2009, at Shigaraki. The horizontal axis is on a linear scale plotting the square of the radius in pixels. The counts in the vertical axis indicate counts per original CCD pixels (which include the bias level).