View source for Change or Exclude Erroneous Head Surface Point Locations

{{BESAInfobox
|title = Module information
|module = BESA Research Basic or higher
|version = 5.2 or higher
}}

== View and save head surface points ==
After importing head surface points, they can be inspected using the menu command ''<span style="color:#3366ff;">File&rarr;Head Surface Points and Sensors&rarr;View</span>'' or ''<span style="color:#3366ff;">V</span>'' on the keyboard. 

If some points were not digitized correctly, it should be apparent from the 3D view. 

To exclude these points, the head surface points can be written to an ASCII file by using the command ''<span style="color:#3366ff;">File&rarr;Head surface points and sensors&rarr;Save all files in head coordinates</span>''. 

[[File:View_and_Save_head_surface_points.png|400px|thumb|right|View and save head surface points in BESA Research]]

== Edit head surface points ==
The digitized head surface points are written to a file entitled ''filename.sfp'', which is located in the same folder as your ela file ''filename.ela''. They can be edited using any text editor program.
 
Then the data file can be re-opened in BESA, and the edited head surface point file is read automatically. 

{{font color|#FF2020| '''Important note: When using MEG and EEG simultaneously, it is important that the ''filename.pos'' file is also written and read in the same coordinate system as the surface points!'''}}

[[Category:Preprocessing]]