TT2TAI:

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   Converts Terrestrial (dynamic) time to Terrestrial atomic time

   Since version 1.
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   Form:
   tAI = TT2TAI( tT )
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   Inputs
   ------
   tdt   (:,:)  Terrestrial (dynamic) time

   -------
   Outputs
   -------
   tAI   (:,:)  Terrestrial atomic time

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