[pism/pism] df14ae: Some clean up in plot script

[Torsten Albrecht]

Branch: refs/heads/pik/fix_taud_margins
Home: https://github.com/pism/pism
Commit: df14aeb88821ab8887f3cd54e9770b11cd32f4b8
https://github.com/pism/pism/commit/df14aeb88821ab8887f3cd54e9770b11cd32f4b8
Author: Torsten Albrecht <albr...@pik-potsdam.de>
Date: 2021-09-28 (Tue, 28 Sep 2021)

Changed paths:
R examples/mismip/check_taud_flowline/README
A examples/mismip/check_taud_flowline/README.md
M examples/mismip/check_taud_flowline/plot_diff.py

Log Message:
-----------
Some clean up in plot script