[Mne_analysis] Obtaining alignment points

[Denis A. Engemann]

> On Jun 16, 2014, at 8:58 AM, Marmaduke Woodman <marmaduke.woodman at univ-amu.fr> wrote:
> 
> Hi,
> 
> In mne-python, I'd like to obtain the nasion, LPA & RPA points read from the head digitization. In my case using a 4D dataset, the raw.info['dig'] field has exactly 3 points not of 'kind' FIFFV_POINT_EXTRA, and each of these three has 'kind' FIFFV_POINT_LPA, though their 'ident' field varies (1, 2, 3).
> 
> I was expected one of each of FIFFV_POINT_{NASION, LPA, RPA}, but I must have missed something. 
> 
> Would someone be able to enlighten on this point?
> 
> 
> Many thanks,
> Marmaduke
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