acement is taken in the direction of the
channel vector and the process is repeated for the next plane.  The net result of
the routines is a series of sphere positions that can be thought of a flexible
sphere "squeezing" through the ion channel.<p>

Output from the procedure is in three forms:
<ol>
       <li>Numerical information as to the radius found is given vs distance
       along the channel is written to the text output file.  This can be input into
       a graph plotting program.
       <li>Graphi