fix rotational diffusion pdf

[mastrof]

Closes #95

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.41%. Comparing base (39ba9e6) to head (dddad9e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   39.79%   40.41%   +0.61%     
==========================================
  Files          24       24              
  Lines         578      584       +6     
==========================================
+ Hits          230      236       +6     
  Misses        348      348              

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