moved legend to the side in parity plots

[kfir4444]

As requested in issue#629. Now, parity plots look like:

[codecov[bot]]

Codecov Report

Merging #646 (8c782e8) into main (262303c) will increase coverage by 0.00%. The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #646   +/-   ##
=======================================
  Coverage   73.12%   73.13%           
=======================================
  Files          99       99           
  Lines       26282    26283    +1     
  Branches     5497     5497           
=======================================
+ Hits        19220    19222    +2     
  Misses       5699     5699           
+ Partials     1363     1362    -1     

Impacted Files	Coverage Δ
arc/plotter.py	27.38% <0.00%> (-0.04%)	:arrow_down:

... and 1 file with indirect coverage changes

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