Fig. 13From: Measurement of thermospheric temperatures using OMTI Fabry–Perot interferometers with 70-mm etalonAn example of azimuthally integrated fringes (thin lines). This was obtained by FP02 for 630.0 nm (sky) on November 6, 2010, at Chiang Mai, Thailand, for which extremely low temperatures were obtained. Thick lines indicate the fitting of Eq. (1). The thin vertical dashed lines indicate the intervals of the free spectral ranges used for the fittingBack to article page