ms used to encode and decode SCLK, and convert between SCLK
   and other time systems are not necessarily the same for each spacecraft.
<P>
 
   The differences are handled by the SCLK software at two levels:
   High-level differences are managed in the code itself through ``clock
   types.'' More detailed spacecraft-specific differences are handled using
   parameters in a SCLK kernel.
<P>
 
<BR><BR>
<A NAME="Clock Types"></A>
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<H3> Clock Types
</H3