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<H2><A NAME="SECTION00735000000000000000">
Setting the Keywords used by the ANALYSE Command</A>
</H2>
Several keywords can be set with the help of the <TT>SET/INV A</TT> command.
This command also displays some keywords that have already been used by the
<TT>SEARCH/INV</TT> command. For your convenience these keywords are the same as
those used in <TT>SEARCH/INV</TT>. Below the additional keywords are listed
as well as those already described above:<DL COMPACT><DT>LHCUTS
<DD>--
See <TT>SEARCH/INV</TT>
<DT>THRESHOLD
<DD>--
See <TT>SEARCH/INV</TT>
<DT>HALFEDGE
<DD>--
See <TT>SEARCH/INV</TT>
<DT>PAIRSPRT
<DD>--
See <TT>SEARCH/INV</TT>
<DT>ANALITER
<DD>--
Default value of this keyword equal to 0 corresponds to the case
that only the base version of the command <TT>ANALYSE/INV</TT> is used.
Any positive value sets the number of additional iterations. In
each of these iterations the contributions from stellar neighbours are
subtracted using the empirical one-dimensional point spread function.
In order to obtain error estimates in the output table (columns 24 to
26) the value of this keyword should be greater than 0. In addition,
the extend of the 2-dim psf has to be defined (keyword FULLPSF, see below).
<DT>PRFLCTRL
<DD>--
Number of central points of the Point Spread Function that are adjusted
by the program. It is done automatically when a positive number is given.
The program assumes the existance of the descriptor STARS in the
input image frame with positions of standard stars when a negative
number is given.
<DT>CLASSPAR
<DD>--
Maximum absolute value of relative gradient for considering the object
as a star.
<DT>ZEROMAGN
<DD>--
Zero point of magnitudes. Should be set in accordance with the value
of the keyword EXPRTIME.
<DT>EXPRTIME
<DD>--
The units of the exposure time should be consistent with the value
of the keyword ZEROMAGN. May be set to 1 if the knowledge of exposure
time is irrelevant
<DT>STMETRIC
<DD>--
Radii in pixels of two concentric circular apertures used to measure
aperture magnitudes. The second of these circular apertures defines
also an area over which the convolved magnitudes are calculated.
<DT>FILTER
<DD>--
See <TT>SEARCH/INV</TT>
<DT>UNITS
<DD>--
Switch between background units (0) and instrumental units (1)
<DT>MARGINS
<DD>--
See <TT>SEARCH/INV</TT></DL>
<P>
Additional keywords are displayed for updating after giving the command
<TT>SET/INV A A</TT>. Only those that have not been described already will
be listed here.<DL COMPACT><DT>FULLPSF
<DD>--
Specifies the extend in pixels of 2-dimensional p.s.f.
<DT>UNDRSMPL
<DD>--
Specifies the undersampling factor.
<DT>OUPROFIL
<DD>--
Specifies a number of pixel spaced points of one-dimensional
intensity profile of objects to be recorded in output table.
<DT>PHYSICAL
<DD>--
See <TT>SEARCH/INV</TT>
<DT>IJBORDER
<DD>--
See <TT>SEARCH/INV</TT>
<DT>XYBORDER
<DD>--
See <TT>SEARCH/INV</TT>
<DT>BRIGHTOB
<DD>--
Helps to remove faint spurious objects close to bright ones. It
may distort central parts of objects, therefore it should be
disabled by setting it to 0 when photometric accuracy is at issue.
Default is 0.
<DT>PRFLCLNG
<DD>--
Parameters used for profile cleaning.
<DT>ISOPHOTR
<DD>--
If set to 1 then the program expects to find isophotal radii of all
objects in a column of an input table with label RAD_ISO.
Relevant only in <TT>NOVERIFY</TT> option. Default is 0.
<DT>ETAFUNCT
<DD>--
Petrosian <IMG
WIDTH="17" HEIGHT="39" ALIGN="MIDDLE" BORDER="0"
SRC="img161.gif"
ALT="$\eta$">-function. Used in measuring the
Petrosian magnitude and radius.
<DT>NEBLIMIT
<DD>-- Relevant for dense configurations of galaxies.
Prevents, when set to a positive value smaller than unity, faint
galaxies from obtaining abnormally large sizes. Should be set to
zero (default) in most other applications.
<DT>SPROFIL1 - SPROFIL5
<DD>--
First 25 points of the initial one-dimensional Point Spread Function.</DL>
<P>
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<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-15</I>
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