Raw
Corrected
Corrected (No mask)
Bright Objects Detected
Faint Objects Detected
Faint Objects Detected; no overlay
Measured Objects
Measured Objects, no mask
The frame reconstructed from Atlas Images
The frame reconstructed from Atlas Images including sky
Measured Objects, with mask
Measured Objects, no mask
The background light level
The background light level in g'
The sky is determined in 256x256 pixel (100x100 arcsec^2) patches with centres spaced every 128 pixels; this is then subtracted from the frames before the faint object finder is run, and the objects measured. Some residual flat fielding problems are also visble.
The background light level in g' for the corresponding frames of run 756
Note that some details of the sky background differ between the runs (e.g. ghosts of stars that are just off the frame).
The background light level in g' for fewer frames of run 745