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A sky-flat image is generated from all-sky imaging data, typically in
conjunction with the building of a pointing model as in
Section 5.4. A typical sky-flat, as shown in
Figure 7.2, is a convolution of the ``real'' twilight flat with a
fringing pattern, described in Section 7.3.3.
A sample sky flat. The fringe pattern
from the night sky lines is clearly evident.