 butterworth, ideal or gaussian to use as the filtering method for the
FreeInit low pass filter.   order (int, optional, defaults to 4) —
Order of the filter used in butterworth method. Larger values lead to ideal method behaviour
whereas lower values lead to gaussian method behaviour.   spatial_stop_frequency (float, optional, defaults to 0.25) —
Normalized stop frequency for spatial dimensions. Must be between 0 to 1. Referred to as d_s in
th