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-=pod
-
-=head1 NAME
-
-
-
-B<RegDiff:Differences Between Funtools and IRAF Regions>
-
-
-
-=head1 SYNOPSIS
-
-
-
-
-Describes the differences between Funtools/ds9 regions and the old IRAF/PROS
-regions.
-
-
-
-=head1 DESCRIPTION
-
-
-
-
-
-We have tried to make Funtools regions compatible with their
-predecessor, IRAF/PROS regions. For simple regions and simple boolean
-algebra between regions, there should be no difference between the two
-implementations.  The following is a list of differences and
-incompatibilities between the two:
-
-
-
-=over 4
-
-
-
-
-
-
-=item *
-
-If a pixel is covered by two different regions expressions,
-Funtools assigns the mask value of the B<first> region that
-contains that pixel.  That is, successive regions B<do not>
-overwrite previous regions in the mask, as was the case with the
-original PROS regions.  This means that one must define overlapping
-regions in the reverse order in which they were defined in PROS.  If
-region N is fully contained within region M, then N should be defined
-B<before> M, or else it will be "covered up" by the latter. This
-change is necessitated by the use of optimized filter compilation, i.e.,
-Funtools only tests individual regions until a proper match is made.
-
-
-
-
-=item *
-
-The B<PANDA> region has replaced the old PROS syntax in which
-a B<PIE> accelerator was combined with an B<ANNULUS> accelerator
-using B<AND>. That is,
-
-  ANNULUS(20,20,0,15,n=4) & PIE(20,20,0,360,n=3)
-
-has been replaced by:
-
-  PANDA(20,20,0,360,3,0,15,4)
-
-The PROS syntax was inconsistent with the meaning of the B<AND> operator.
-
-
-
-
-=item *
-
-The meaning of pure numbers (i.e., without format specifiers) in 
-regions has been clarified, as has the syntax for specifying coordinate
-systems. See the general discussion on
-Spatial Region Filtering
-for more information.
-
-
-
-=back
-
-
-
-
-
-=head1 SEE ALSO
-
-
-
-See funtools(n) for a list of Funtools help pages
-
-
-
-=cut