[Mne_analysis] Obtaining alignment points

[Marmaduke Woodman]

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