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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.

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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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