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<H2><A NAME="SECTION00687000000000000000">
Combine Example</A>
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<P>
As an example of the use of a Association Table similar to the one
displayed in Table <A HREF="node40.html#ccd:association-table">3.1</A>. Let us create a
master flat frame to be used for the reduction of the science frame
<TT>susi0100.bdf</TT>. Suppose the Association Table contains the name
of the master flat to be created: <TT>susi_140_142_143.bdf</TT>.
Hence, three flats have to be combined, namely <TT>susi0140.bdf</TT>,
<TT>susi0142.bdf</TT>, and <TT>susi0143.bdf</TT>. To combine these frames
into the master flat field we enter:
<BLOCKQUOTE>
<TT>SELECT/TABLE asso_tbl <BR>
COMBINE/CCD FF asso_tbl
</TT></BLOCKQUOTE> The command will go the Association Table, checks the output name for
the flat to be created for science frame <TT>susi0100</TT>, makes a list
of single flats to be combined and does the combining. The output on the
screen and stored in the MIDAS log file will look like (<TT>VERBOSE=YES</TT>):
<P><PRE>
Combining FLAT frames: Input=asso_tbl.tbl; output=susi_140_142_143.bdf
Statistics of frame no. 0:
area [@60,@10:@1070,@1020] of frame
minimum, maximum: 5.560000e+02 8.654000e+03
mean, standard_deviation: 6.101316e+03 1.913127e+02
Statistics of frame no. 1:
area [@60,@10:@1070,@1020] of frame
minimum, maximum: 8.390000e+02 1.276900e+04
mean, standard_deviation: 8.313817e+03 2.569877e+02
Statistics of frame no. 2:
area [@60,@10:@1070,@1020] of frame
minimum, maximum: 4.220000e+02 1.046500e+04
mean, standard_deviation: 5.622723e+03 1.722370e+02
Method=avsigclip, low= 0.00, high= 0.00
lowclip= 3.00, highclip= 3.00
frame # Ncomb Exp_time Mode Scale Offset Weight
susi0140.bdf 1 1.00 571.878 1.093 -0 0.333
susi0142.bdf 1 5.00 862.392 0.725 -0 0.333
susi0143.bdf 1 5.00 441.692 1.416 -0 0.333
--------------------------------------------------------------------
Statistics of output frame susi_140_142_143.bdf:
area [@60,@10:@1070,@1020] of frame
minimum, maximum: 6.045866e+02 1.023942e+04
mean, standard_deviation: 6.886717e+03 2.060752e+02
Ncomb Exp_time Mean Mode N_undef
susi0100_ff 3 3.933 6886.72 623.478 0
Undefined pixels, set to `null value' (= 0.000000)
--------------------------------------------------------------------
</PRE>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
</ADDRESS>
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