input_fname : str 
 
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. 
 
stim : list of int | ‘<’ | ‘>’ 
Channel-value correspondence when converting KIT trigger channels to a
Neuromag-style stim channel. For ‘<’, the largest values are assigned
to the first channel (default). For ‘>’, the largest values are
assigned to the last channel. Can also be specified as a list of
trigger channel indexes. 
 
slope : ‘+’ | ‘-‘ 
How to interpret values on KIT trigger channels when synthesizing a
Neuromag-style stim channel. With ‘+’, a positive slope (low-to-high)
is interpreted as an event. With ‘-‘, a negative slope (high-to-low)
is interpreted as an event. 
 
stimthresh : float 
The threshold level for accepting voltage changes in KIT trigger
channels as a trigger event. 
 
preload : bool 
If True, all data are loaded at initialization.
If False, data are not read until save. 
 
stim_code : ‘binary’ | ‘channel’ 
How to decode trigger values from stim channels. ‘binary’ read stim
channel events as binary code, ‘channel’ encodes channel number. 
 
verbose : bool, str, int, or None 
 
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