">!                 --THE INPUT FREQUENCY F MUST BE</span>
<span class="c">!                   SMALLER THAN 0.5.</span>
<span class="c">!     OTHER DATAPAC   SUBROUTINES NEEDED--PLOTX.</span>
<span class="c">!     FORTRAN LIBRARY SUBROUTINES NEEDED--SQRT, SIN, COS, ATAN.</span>
<span class="c">!     MODE OF INTERNAL OPERATIONS--.</span>
<span class="c">!     COMMENT--IN ORDER THAT THE RESULTS OF THE COMPLEX DEMODULATION</span>
<span class="c">!              BE VALID AND PROPERLY INTERPRETED, THE INPUT DATA<