matplotlib agg fix.

[knc6]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.45%. Comparing base (ea84615) to head (f3a3779).
Report is 12 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
- Coverage   73.46%   73.45%   -0.01%     
==========================================
  Files          17       17              
  Lines        2845     2844       -1     
==========================================
- Hits         2090     2089       -1     
  Misses        755      755              

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