skull_percentile : float, optional
The percentile of the values in the image that delimit the skull from
the outside of the brain. The smaller the fraction of you field of view
is occupied by the brain, the larger this value should be.
wm_percentile : float, optional
The percentile of the values in the image that delimit the white matter
from the grey matter. Typical this is skull_percentile + 1
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