TelemetryDictionary:

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   Load the dictionary of telemetry data to be gathered for the DFF system.

   Since version 7.
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   Form:
   t = TelemetryDictionary;
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   Inputs
   ------
   none

   -------
   Outputs
   -------
   t            {:,4}     Cell array of telemetry info
                             {name,   subsystem,  default data,  description}

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