d in a variety of units. The rate values have
   units that depend on the units used for the parallel time values: if we
   call these units
<P>
 
<PRE>
   PARALLEL_TIME_UNITS
</PRE>
   then the rate units are
<P>
 
<PRE>
      PARALLEL_TIME_UNITS
   ----------------------------
   most significant clock count
</PRE>
   The term most ``significant clock count'' shown in the denominator
   refers to the length of time associated with one count of the most
   significant (leftmost) field of the formatted spac