Add version of FM90 using B3 instead of C3 #201
Merged
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The FM90 formulation for the bump "strength" is C3. This is not the amplitude. That is C3/gamma^2. For ease of interpretation and fitting, it is better to use the bump amplitude B3 = C3/gamma^2. B3 is then the height of the 2175 A bump. And B3 is not strongly correlated with gamma in the fitting, unlike C3.