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Figure 3: GUI of the SAMI data-taking software. convention,1 these keywords indicate the position angle of the RA and DEC axes relative to the +Y-axis of the CCD, counting positive CCW. For SAMI, the correct relations are: DECP AN GL = P A RAP AN GL = P A − 90 (1) (2) The keywords in the SAMI headers actually correspond to these relations. For example, the image mzfsoar20121203.028.fits has 1 http://iraf.noao.edu/projects/ccdmosaic/imagedef/fitsdic.html 6
