Creates a stack of background regions for a given source list
The mkBgReg.pl script takes an input source list and scaling
factor (N). It creates a list of background regions with
radii N times the source radii.
The script works on CIAO format region files for circular and
elliptical regions in physical coordinates.
This script is used in conjunction with mkSubBgReg.pl ("ahelp
mksubbgreg") in the Create an Image of Diffuse Emission thread.
unix% mkBgReg.pl
ASCII region file (CIAO format): sources_mod.reg
Multiply source radius by: 2
Output filename: bkg.reg
Create a stack of background regions centered on the
source regions in "sources_mod.reg" with radii twice as
large.
Note that the script always prompts for the inputs, even
if they are supplied on the command line.
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