(1993 Jul. 28) subject: Re:CCD charts Dear Bill, Thank you for your interest in my charts. Coordinates are given in a unit of 0.02 arcsec. Our CCD covers 7 x 10 arcmin. The increasing direction of y correspends to the north and x to the west, respectively. There is no rotation between two charts. The errors of the coordinates will be less than 0.5 arcsec and magnitudes less than 0.1 mag in most cases. Regards, Taichi Kato
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