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

  FT_PLOT_CROSSHAIR plots a crosshair at a specified position in two [x, y] or three
  [x, y, z] dimensions. 
 
  Use as
    h = ft_plot_crosshair(pos, ...)
  where pos is the desired position of the crosshair. The handles of the lines are
  returned.
 
  Optional input arguments should be specified in key-value pairs and can include
    'color'    = [r g b] value or string, see PLOT
    'parent'   = handle of the parent axes
    'handle'   = handle of the existing line objects to be updated
  
  You can specify the handles of existing line objects which will be then updated,
  rather than creating a new set of lines. If both parent and handle ar specified,
  the handle option prevail.
  
  Example
    ft_plot_crosshair([0.5 0.5], 'color', 'r')
 
  See also FT_PLOT_BOX, FT_PLOT_LINE, TEXT, LINE