Fitting with B3

[karllark]

Now fitting for FM90_B3 instead of FM90 (using C3) is an option.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 39.44%. Comparing base (14d38b4) to head (68bb3c4).

Files with missing lines	Patch %	Lines
measure_extinction/modeldata.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   39.47%   39.44%   -0.03%     
==========================================
  Files          22       22              
  Lines        3035     3037       +2     
==========================================
  Hits         1198     1198              
- Misses       1837     1839       +2     

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