Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_read_vol”.

  FT_READ_VOL reads a volume conduction model from various manufacturer
  specific files. Currently supported are ASA, CTF, Neuromag, MBFYS
  and Matlab.
 
  Use as
    headmodel = ft_read_vol(filename, ...)
 
  Additional options should be specified in key-value pairs and can be
    'fileformat'   string
 
  The volume conduction model is represented as a structure with fields
  that depend on the type of model.
 
  See also FT_TRANSFORM_VOL, FT_PREPARE_VOL_SENS, FT_COMPUTE_LEADFIELD