Fix plot of simulated signal and noise of 2nd pass image extraction

[HealthyPear]

Closes #98

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Codecov Report

Merging #99 (10faeb4) into master (e8a51f1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #99   +/-   ##
=======================================
  Coverage   36.81%   36.81%           
=======================================
  Files          18       18           
  Lines        1798     1798           
=======================================
  Hits          662      662           
  Misses       1136     1136           

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