improve pairplot options

[janfb]

closes #864

[codecov]

Codecov Report

Merging #865 (6787abf) into main (8769e25) will increase coverage by 0.96%.
Report is 3 commits behind head on main.
The diff coverage is 73.91%.

@@            Coverage Diff             @@
##             main     #865      +/-   ##
==========================================
+ Coverage   74.60%   75.56%   +0.96%     
==========================================
  Files          80       80              
  Lines        6242     6250       +8     
==========================================
+ Hits         4657     4723      +66     
+ Misses       1585     1527      -58     

Flag	Coverage Δ
unittests	75.56% <73.91%> (+0.96%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
sbi/analysis/tensorboard_output.py	86.25% <ø> (ø)
sbi/analysis/plot.py	70.63% <73.91%> (+14.19%)	⬆️

... and 3 files with indirect coverage changes

[michaeldeistler]

Thanks! I have very mixed feelings about the cross though -- I personally prefer the dot (simply because it looks better).