@agramfort -- if you could give me your opinion about the scaling semantics --- see options below :-) -- I can later update the PR.

On 12.06.2013, at 21:48, Alexandre Gramfort <notifications@github.com> wrote:

> In mne/viz.py:
> 
> > @@ -250,6 +276,16 @@ def plot_topo(evoked, layout, layout_scale=0.945, color=None, title=None):
> >          Everything matplotlib accepts to specify colors. If not list-like,
> >          the color specified will be repeated. If None, colors are
> >          automatically drawn.
> > +    border : str
> > +        Borders style to be used for each sensor plot.
> > +    scaling : None | dict | callable
> > +        The scaling method to be applied to channel types. If None, peak-to-peak
> > +        scaling will be used for each sensor and each channel type. If dict
> > +        a scalar value can be assigned to each sensor type, e.g.,
> > +        dict(mag=mag=1e-4). If callable a functoon is expected that returns
> > +        a float value and takes an array-like objet as argument, e.g.
> > +        lambda x: max(abs(x)). The funciton will then be applied separately
> > +        to each sensor type.
> sorry but what was the old behavior? use global scaling default?
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