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

  FT_PLOT_AXES adds three axes of 150 mm and a 10 mm sphere at the origin to the
  present 3-D figure. The axes and sphere are scaled according to the units of the
  geometrical object that is passed to this function. Furthermore, when possible,
  the axes labels will represent the aanatomical labels corresponding to the
  specified coordinate system.
 
  Use as
    ft_plot_axes(object)
 
  Additional optional input arguments should be specified as key-value pairs
  and can include
    'axisscale'    = scaling factor for the reference axes and sphere (default = 1)
    'unit'         = string, convert the data to the specified geometrical units (default = [])
    'coordsys'     = string, assume the data to be in the specified coordinate system (default = 'unknown')
    'fontcolor'    = string, color specification (default = [1 .5 0], i.e. orange)
    'fontsize'     = number, sets the size of the text (default is automatic)
    'fontunits'    =
    'fontname'     =
    'fontweight'   =
 
  See also FT_PLOT_SENS, FT_PLOT_MESH, FT_PLOT_ORTHO, FT_PLOT_HEADSHAPE, FT_PLOT_DIPOLE, FT_PLOT_VOL