Internal function to get some demo EEG electrode coordinates. Will be removed from public API. Do not use this.
vector of character strings, electrode names like 'Nz' or 'RPA'. ÖLeave at the default value 'NULL' to get all available ones.
data.frame with one row per electrode, and the following 3 columns: 'label': the electrode name, 'theta': the azimuth in degrees, 'phi': the latitude in degrees.
There are lots of different naming conventions for spherical coordinates, see https://en.wikipedia.org/wiki/Spherical_coordinate_system.
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