UnwrapPhase:

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   Unwrap a vector of angular values to change continuously.
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   Form:
   theta = UnwrapPhase( theta );
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   ------
   Inputs
   ------
   theta            (1,:) Vector of wrapped angular values [rad]

   -------
   Outputs
   -------
   theta            (1,:) Vector of unwrapped angular values [rad]

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