> @agramfort pretty neat :). Do you think it is mature enough to be a
> runtime dependency for the volume plotting?

maybe we can ask if @AlexandreAbraham is willing a version on pypi
that is easy_installable? or we can add it to an mne.external module
if it's not too long in terms of lines.

> Alternatively, instead of having a volume plot function, we could just
> have an example which exports to nifti and uses pynax for the plotting.
> Maybe this would be better anyways, as it exposes all the functionality to
> the user.

yes. dependencies in examples are more ok.