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   A clock type is a general clock description that may encompass several
   separate spacecraft clocks. Each clock type is identified in the SCLK
   functions by an integer code. At the release date of the current
   revision of this document, all supported missions use spacecraft clock
   type 1.
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   A spacecraft clock data type has two components: a format defining the
   set of acceptable spacecraft clock (SCLK) strings, and a method of
   converting SCLK strings to a standard time rep