his case, values of <b>width = 2 or 3</b> are
usually sufficient. <b>ncut</b> should be equal to the number of points in
the transform at which it drops to zero. To determine this, transform
the data using <a href="fourtran.html">fourtran</a> and plot it. Then
place the cursor over the point at which the plot drops to zero and
use the displayed point value as <b>ncut</b>.<p>

The third form applies a boxcar filter of a specified <b>width</b>.
<b>width</b> and <b>ncut</b> should be determined in the same way