/span>
<span class="c">!              IN X SHOULD BE EQUI-SPACED IN TIME</span>
<span class="c">!              (OR WHATEVER VARIABLE CORRESPONDS TO TIME).</span>
<span class="c">!            --IF THE INPUT OBSERVATIONS IN X ARE CONSIDERED</span>
<span class="c">!              TO HAVE BEEN COLLECTED 1 SECOND APART IN TIME,</span>
<span class="c">!              THEN THE DEMODULATION FREQUENCY F</span>
<span class="c">!              WOULD BE IN UNITS OF HERTZ</span>
<span class="c">!              (= CYCLES PER