An alternative to **sufilter** is **subfilt**, which
applies a Butterworth filter to data.

% suplane | subfilt fstoplo=10 fpasslo=20 fpasshi=30 fstophi=60 | suxwigb title="10,20,30,60 hz bandpass bfilt" &

\subsection{SUACOR - auto-correlation} This program is used to compute the autocorrelation of a trace. This process is useful to see the size of a wavelet, or the repetitions of the wavelet, as an aid in choosing the {\bf maxlag\/} parameter of {\bf supef}. {\bf Suacor\/} is also useful for determining the frequency range of data in terms of the power spectrum. For example try {\small \begin{verbatim} % suplane | sufilter | suacor | suspecfx | suxwigb &

John Stockwell 2007-04-10