fnames : list, or string
A list of the raw files to treat as a Raw instance, or a single
raw file. For files that have automatically been split, only the
name of the first file has to be specified. Filenames should end
with raw.fif, raw.fif.gz, raw_sss.fif, raw_sss.fif.gz,
raw_tsss.fif or raw_tsss.fif.gz.
allow_maxshield : bool, (default False)
allow_maxshield if True, allow loading of data that has been
processed with Maxshield. Maxshield-processed data should generally
not be loaded directly, but should be processed using SSS first.
preload : bool or str (default False)
Preload data into memory for data manipulation and faster indexing.
If True, the data will be preloaded into memory (fast, requires
large amount of memory). If preload is a string, preload is the
file name of a memory-mapped file which is used to store the data
on the hard drive (slower, requires less memory).
proj : bool
Apply the signal space projection (SSP) operators present in
the file to the data. Note: Once the projectors have been
applied, they can no longer be removed. It is usually not
recommended to apply the projectors at this point as they are
applied automatically later on (e.g. when computing inverse
solutions).
compensation : None | int
If None the compensation in the data is not modified.
If set to n, e.g. 3, apply gradient compensation of grade n as
for CTF systems.
add_eeg_ref : bool
If True, add average EEG reference projector (if it’s not already
present).
verbose : bool, str, int, or None
If not None, override default verbose level (see mne.verbose).
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