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<H3><A NAME="SECTION003511200000000000000">
<TT>TESTFA/CCD</TT></A>
</H3>
The command does a series of tests on a catalogue of low count
flats. The whole is split in two smaller tests, commands <TT>TESTF1/CCD</TT>
to <TT>TESTF2/CCD</TT> that do the following:
<DL COMPACT>
<DT>1.
<DD>Test F1: Creation of the combined flat frame, using only those flat
frames in the input catalogue that have exposure times
falling within the allowed range. The combined flat is
corrected for the bias offset. The bias offset is taken
from the keyword BIASMEAN filled by the command TESTB/CCD.
The combined flat is loaded on the display.
<DT>2.
<DD>Test F2: Thereafter all pixels in the stacked master flat frame that
show values less than thresh times the median counts in the
frame are listed. Only pixels within the area contained in
`area' are considered and repetitions of cold pixels in the
increasing y coordinate are not listed.
</DL>
<P>
The complete <TT>TESTFA/CCD</TT> command produces the following:
<UL>
<LI>A combined low count flat frame corrected for the bias offset;
<LI>An ASCII and MIDAS table containing traps and other defects
in the stacked master flat frame that show values less than
<I>N</I> times the median counts in the frame. Only pixels
within the input area are considered and repetitions of cold
pixels in the increasing y coordinate are not listed.
</UL> The combined low count flat field is corrected for the mean bias
offset, stored in the keyword <TT>BIASMEAN</TT>, filled by the command
<TT>TESTB/CCD</TT>. The user can also supply this keyword with the
name of the combined bias frame, also produced by <TT>TESTB/CCD</TT>.
In that case this frame will be used for the bias correction.
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
</ADDRESS>
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