Correct bug in file name inside _plot_stripes_helper

[rea1991]

".2g" is replaced with ".f" so that plots are listed in the correct canonical ordering, i.e., with increasing thresholding of the relative change parameter.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.32%. Comparing base (5559ec8) to head (e27a918).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #93   +/-   ##
=======================================
  Coverage   85.32%   85.32%           
=======================================
  Files          19       19           
  Lines        2481     2481           
=======================================
  Hits         2117     2117           
  Misses        364      364           

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