XMM-Newton Science Analysis System


esplinemap (esplinemap-5.4.1) [22.0.0-9173c7d25-20250127]

Algorithm

subroutine esplinemap

  
  1) If out-of-time events flag is set: Calculate background due to
     OOT events and subtract from image.
  2) Remove source count dependent circular area around EBOXDETECT 
     (local mode) sources
     which have detection likelihoods greater than a specifiable
     threshold from the image. 
  3) If exposure flag is set, divide image by exposure map.
  4) Perform spline fit of image, using a user-specifiable
     number of spline nodes. If detection mask flag is set,
     only use image regions marked by detection mask. 
  5) If exposure flag is set, multiply spline image by exposure map.
  6) IF rebinned image pixels contain excesses above spline fit  
     THEN
       remove excesses from image and repeat (2) - (5) a specifiable 
       number of times
     END IF
   7) If out-of-time events flag is set: Add OOT events background to background map.

end subroutine  esplinemap