raft clock's readout values occurs, a new partition is
   started. Discontinuities may consist of positive jumps, in which the
   spacecraft clock's readout ``skips'' ahead, or negative jumps, in which
   the spacecraft clock regresses.
<P>
 
   The fact that a spacecraft clock may regress raises the possibility that
   the clock may give the same reading at two or more different times. For
   this reason, SCLK strings in CSPICE are prefaced with partition numbers.
<P>
 
   The partition number is a positiv