Add size distribution plot ptype

[alexmaragko]

Small fix to fitted.py. Added size distribution plot ptype to avoid overwriting of "fitted" plot.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.69%. Comparing base (e1dfed1) to head (46147c5).
⚠️ Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #27      +/-   ##
==========================================
+ Coverage   81.60%   82.69%   +1.08%     
==========================================
  Files          25       25              
  Lines        3822     3848      +26     
==========================================
+ Hits         3119     3182      +63     
+ Misses        703      666      -37     

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