XMM-Newton Science Analysis System


emask (emask-2.16) [22.0.0-9173c7d25-20250127]

Algorithm

 Begin subroutine emask

   Determine maximum of exposure
   Multiply threshold parameters with exposure maximum
   
   Optionally read region file

   Loop over image pixels 
     Set pixels of detection mask to 1 if exposure is above cutoff 
       and 0 otherwise.
     Set pixels inside excluded regions to 0.
   END Loop

   Loop over image pixels
     Set pixels of detection mask to 0 if gradient of exposure 
       is above threshold.
   END Loop

 End subroutine emask