Fig. 5
From: Calibration of imaging parameters for space-borne airglow photography using city light positions
Limb profiles of the three channels derived from photograph A. The coordinates of the tangential point at 90 km were 12.6° S and 130.5° E. The recoded time is 13:47:00.08 UT. The raw counts of the pixels along the vertical line of the image are averaged to 10 pixels horizontally so as to increase the signal-to-noise ratio and are plotted as a function of tangential altitude. The limb profile has its tangential point at 32.3°S and 124.2°E and 90 km in altitude. The error bars show the standard deviation of the averaged pixels. The green, red, and blue lines indicate the green, red, and blue channels, respectively