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<H3><A NAME="SECTION00846100000000000000">
DIAPHRAGM/ROMAFOT</A>
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<TT>DIAPHRAGM/ROMAFOT</TT>
<FONT SIZE="-1"><TT>frame [regi_tab] [rego_tab] ap_rad</TT></FONT>
<P>
This command performs aperture photometry at given positions.
These positions are read from a registration table created by
<TT>REGISTER/ROMAFOT</TT>. Values of the sky background are read as well.
<P>
This command has two fairly different applications. The first application
is fast photometry of many objects with the sequence of commands
<TT>SKY/ROMAFOT</TT>, <TT>SEARCH/ROMAFOT</TT>, <TT>DIAPHRAGM/ROMAFOT</TT>.
The second application is to calibrate a frame transporting standard
magnitudes from another frame. Given the importance of a careful
determination of the sky background, the previous use of <TT>FIT/ROMAFOT</TT>
is not redundant in this second case. The user is allowed to select
the diaphragm over which the integration is performed. Usually a
compromise between large apertures (to sample <I>all</I> the stellar
contribution) and small apertures (to minimise the light from nearby
companions) is necessary.
<P>
This module creates an output file with the same structure as
that created by <TT>FIT/ROMAFOT</TT>. However, the instrumental magnitude
is determined by summing up the pixel intensities above the sky within
the diaphragm.
<P>
<BR><HR>
<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
</ADDRESS>
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