fix and fix up model graphs

[jmccreight]

No description provided.

[codecov-commenter]

Codecov Report

Merging #162 (a8b4da2) into main (adb5a87) will not change coverage.
The diff coverage is 17.64%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@           Coverage Diff           @@
##             main     #162   +/-   ##
=======================================
  Coverage   79.31%   79.31%           
=======================================
  Files          48       48           
  Lines        6067     6067           
=======================================
  Hits         4812     4812           
  Misses       1255     1255           

Impacted Files	Coverage Δ
pywatershed/base/model.py	95.23% <ø> (-0.04%)	⬇️
pywatershed/analysis/model_graph.py	15.07% <16.66%> (+0.67%)	⬆️
pywatershed/analysis/process_plot.py	26.38% <20.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more