Digitally Stacking SuperCOSMOS scans

• SGP - 9 Bj, 7 R, 5 I and 3 U plates

• 10h40 - 13 Bj, 26 R, 9 I and 5 U plates

• Background subtraction with a median filter

• Coadd data with IRAF’s imcombine task

• Weighted average with min-max rejection

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