fname : str
The raw file to load. For files that have automatically been split,
the split part will be automatically loaded. 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 | str (default False)
If True, allow loading of data that has been recorded with internal
active compensation (MaxShield). Data recorded with MaxShield should
generally not be loaded directly, but should first be processed using
SSS/tSSS to remove the compensation signals that may also affect brain
activity. Can also be “yes” to load without eliciting a warning.
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).
add_eeg_ref : bool
If True, an EEG average reference will be added (unless one
already exists). This parameter will be removed in 0.15. Use
mne.set_eeg_reference() instead.
verbose : bool, str, int, or None
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