XMM-Newton Science Analysis System


backscale (backscale-1.6) [22.0.0-9173c7d25-20250127]

Algorithm

Create a grid which encompasses the source region
with 
   grid_element_Width = 20 * badpixelresolution

area=0
Loop over each grid element
{
   if (element lies within a CCD) {
      area = area + grid_element_Width * grid_element_Width
   }
}
Loop over each bad pixel
{
   if (bad pixel lies within source region) {
      area = area - bad_pixel_area_in_detector_pixels
   }
}