Error while executing notebook Sec_03_Plotting.ipynb

[BHFock]

I experience a crashing kernel when executing popup_2d_xx_yy(...).

[trexfeathers]

@BHFock have you seen #47? Do you think this would fix the bug you have reported?

[BHFock]

@trexfeathers, I noticed #47 - it looks similar, but I can't judge if that will help. Happy to help testing once the PR is completed.