eng15kf5_2_DIT.fits    - two example FITS images using double-correlated
eng15kf5_2_DIT.ps        sampling 
eng15kf5_3_DIT.fits    - ps are high resolution screen captures from ds9
eng15kf5_3_DIT.ps


diff.fits              - difference image from simple subtraction and 
diff.ps                  restoring <average> background level

diff_hist.ps           - histogram of difference image, the expected photon
                         noise level is ~50, the estimate on plot is biassed
                         slightly low by the spike due to the "out-of-Africa" 
                         region