subject : str 
 
source : str | list of str 
Type to load. Common choices would be ‘bem’ or ‘head’. We first
try loading ‘$SUBJECTS_DIR/$SUBJECT/bem/$SUBJECT-$SOURCE.fif’, and
then look for ‘$SUBJECT*$SOURCE.fif’ in the same directory by going
through all files matching the pattern. The head surface will be read
from the first file containing a head surface. Can also be a list
to try multiple strings. 
 
subjects_dir : str, or None 
Path to the SUBJECTS_DIR. If None, the path is obtained by using
the environment variable SUBJECTS_DIR. 
 
verbose : bool, str, int, or None 
 
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