Because the docstring of add_source_space_distances says it can maximally run as many jobs as there are source spaces

> On Mar 20, 2014, at 3:41 AM, Alexandre Gramfort <notifications@github.com> wrote:
> 
> In mne/coreg.py:
> 
> > @@ -1085,6 +1086,9 @@ def scale_source_space(subject_to, src_name, subject_from=None, scale=None,
> >          otherwise it is read from subject_to's config file.
> >      subjects_dir : None | str
> >          Override the SUBJECTS_DIR environment variable.
> > +    n_jobs : 1 | 2
> why only 1 or 2?
> 
> —
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