CE THE AMPLITUDE AND PHASE PLOTS</span>
<span class="c">!              HAVE N - 2/F VALUES</span>
<span class="c">!              (RATHER THAN N VALUES) ALONG THE</span>
<span class="c">!              HORIZONTAL (TIME) AXIS.</span>
<span class="c">!              IN ORDER THAT THE AMPLITUDE AND PHASE</span>
<span class="c">!              PLOTS BE NON-EMPTY, AN INPUT</span>
<span class="c">!              REQUIREMENT ON F FOR THIS SUBROUTINE</span>
<span class="c">!              IS THAT THE SAMPLE SIZE N</span>