The following image (upper) shows the
typical bias images (1X1 binning) of chip1 (right) and chip2 (left).
These images are shown as is (i.e., no image flips/rotation, or,
vertical direction for Y and horizontal direction of X of the CCD
coordinates). See a cartoon below (these two are shown at same
orientation). As you can see, chip 1 has larger number of dead columns,
especially near the optics axis and toward high Y regions. Note that
there are some more weaker dead columns, i.e., not all dead columns can
be seen in the following images.
See also
this
page for more information on CCD orientation.
