 data column
length, then it is used directly for subsetting. If <code>parameters</code> is a numerical vector with
two elements, then the index or scan values that lie between <code>parameters[1]</code>
and <code>parameters[2]</code> (inclusive) are used for subsetting.  The
two-element method is probably the most useful, with the values being determined by visual
inspection of the results of <code><a href="plotScan.html">plotScan()</a></code>. While this may take a minute or two, the
analyst should bear i