CONV NORM
# 5x5 convolution mask of a mexican-hat for images with FWHM~1.5 pixels.
-0.000109 -0.002374 -0.006302 -0.002374 -0.000109
-0.002374 -0.032222 -0.025569 -0.032222 -0.002374
-0.006302 -0.025569 0.276021 -0.025569 -0.006302
-0.002374 -0.032222 -0.025569 -0.032222 -0.002374
-0.000109 -0.002374 -0.006302 -0.002374 -0.000109
