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All images, warps and stacks, have mask images which indicate image flags for each individual pixels. Below is a table that indicates the meaning for each flag. These flags are applicable for both, the warp and stack images.


Image Flags

Mask values which represent features of the detector

Flag namehexadecimal valueDescription
FLAT0x0002Pixel doesn't flat-field properly
DARK0x0004Pixel doesn't dark-subtract properly
BLANK0x0008Pixel doesn't contain valid data
CTE0x0010Pixel has poor Charge Transfer Effici
SAT0x0020Pixel is saturated or non-linear




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