Write BEM surfaces to a fiff file.
strFilename to write. Can end with .h5 to write using HDF5.
dict | list of dictThe surfaces, or a single surface.
If True (default False), overwrite the destination file if it exists.
str | int | NoneControl verbosity of the logging output. If None, use the default
verbosity level. See the logging documentation and
mne.verbose() for details. Should only be passed as a keyword
argument.