Fig. 2.
Extracting the trace contours from a SEDM dome exposure. Left CCD image of a dome exposure. The gray rectangle shows the zoom area displayed on the right. Upper right: sep ellipses overplotted on the CCD dome image. Lower right: spaxel-trace contours overplotted on the CCD dome image. For the SEDM, spaxel-trace contours are defined as tilted rectangles. The rotation angle of the centroid position are derived from the sep ellipses.
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