A tally with an energy filter has multiple values and there is not arg to indicate which one to plot. So for now we can check for the existance of energy filters that have more than 1 num_dims and raise a value error with a clear message to the user.
As discussed here https://openmc.discourse.group/t/neutron-flux-in-a-graphite-stack/3916/15
A tally with an energy filter has multiple values and there is not arg to indicate which one to plot. So for now we can check for the existance of energy filters that have more than 1 num_dims and raise a value error with a clear message to the user.