input_fname : str 
 
events : array, shape (n_events, 3) 
The events typically returned by the read_events function.
If some events don’t match the events of interest as specified
by event_id, they will be marked as ‘IGNORED’ in the drop log. 
 
event_id : int | list of int | dict | None 
The id of the event to consider. If dict,
the keys can later be used to access associated events. Example:
dict(auditory=1, visual=3). If int, a dict will be created with
the id as string. If a list, all events with the IDs specified
in the list are used. If None, all events will be used with
and a dict is created with string integer names corresponding
to the event id integers. 
 
mrk : None | str | array_like, shape (5, 3) | list of str or array_like 
Marker points representing the location of the marker coils with
respect to the MEG Sensors, or path to a marker file.
If list, all of the markers will be averaged together. 
 
elp : None | str | array_like, shape (8, 3) 
Digitizer points representing the location of the fiducials and the
marker coils with respect to the digitized head shape, or path to a
file containing these points. 
 
hsp : None | str | array, shape (n_points, 3) 
Digitizer head shape points, or path to head shape file. If more than
10,000 points are in the head shape, they are automatically decimated. 
 
verbose : bool, str, int, or None 
 
 |