improve label formatting on gammaness efficiency plot

[vuillaut]

No description provided.

[codecov]

Codecov Report

Merging #155 (e6fcc4c) into master (e768294) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
+ Coverage   65.64%   65.66%   +0.01%     
==========================================
  Files          21       21              
  Lines        2620     2621       +1     
==========================================
+ Hits         1720     1721       +1     
  Misses        900      900              

Impacted Files	Coverage Δ
ctaplot/plots/plots.py	78.67% <100.00%> (+0.02%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 143b6a2...e6fcc4c. Read the comment docs.