CONV NORM
# 7x7 convolution mask of a mexican-hat for images with FWHM~2.0 pixels.
-0.000006 -0.000132 -0.000849 -0.001569 -0.000849 -0.000132 -0.000006 
-0.000132 -0.002989 -0.017229 -0.028788 -0.017229 -0.002989 -0.000132 
-0.000849 -0.017229 -0.042689 0.023455 -0.042689 -0.017229 -0.000849 
-0.001569 -0.028788 0.023455 0.356183 0.023455 -0.028788 -0.001569 
-0.000849 -0.017229 -0.042689 0.023455 -0.042689 -0.017229 -0.000849 
-0.000132 -0.002989 -0.017229 -0.028788 -0.017229 -0.002989 -0.000132 
-0.000006 -0.000132 -0.000849 -0.001569 -0.000849 -0.000132 -0.000006