Subtracts source regions from background regions
The mkSubBgReg.pl script takes input source and background
lists and subtracts the corresponding source region from
each background region.
The script works on CIAO format region files for circular and
elliptical regions in physical coordinates. The output region
file cannot be displayed in ds9 due to the subtracted regions.
This script is used in conjunction with mkBgReg.pl ("ahelp
mkbgreg") in the Create an Image of Diffuse Emission thread.
unix% mkSubBgReg.pl
ASCII source region file (CIAO format): sources_mod.reg
ASCII background region file (CIAO format): bkg_mod.reg
Output filename: bkg_sub.reg
Subtract the corresponding source region in
"sources_mod.reg" from each background region in
"bkg_mod.reg". The output region file, "bkg_sub.reg",
contains the results:
unix% less bkg_sub.reg
ellipse(4055.19,3893.76,7.99,5.71,39.83)-ellipse(4055.19,3893.76,2.94,2.35,39.83)
ellipse(4098.84,3656.79,13.02,7.07,51.12)-ellipse(4098.84,3656.79,6.51,3.53,51.12)
...
Note that the script always prompts for the inputs, even
if they are supplied on the command line.
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