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Description
In the IDL implementation (see https://solarphysics.aber.ac.uk/mgn.pro), the minimum and maximum values for the gamma-transform, called
a0
anda1
, are input arguments. However, in this translation, they are fixed as the min and max values of the image. This PR makes them arguments that default to the min and max of the image. This should probably include a test for non-None values of these kwargs...