\(T \times V\) data matrix whose columns will be detrended
HP_sigma
The frequency parameter, sigma, for the highpass filter.
Recommended HP_sigma: 1/(2*f*TR), where f is the cutoff
filter in Hz and TR is the time resolution in seconds (See jiscmail
link in function description).
Default: 2000.
LP_sigma
The frequency parameter, sigma, for the lowpass filter.