XMM-Newton Science Analysis System


backscale (backscale-1.3) [xmmsas_20041122_1834-6.1.0]

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Algorithm

Create a grid which encompasses the source region

if (source region half-width < 2 arcmins) {
   grid_element_Width = 10
}
else {
   grid_element_Width = 20
}

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
   }
}