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Unwrap phase before interpolating #4

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Unwrapping phase can be inaccurate if performed after setting values to NaN for interpolation (i.e. if the NaN period overlaps with the wrapped phase crossing the pi boundary). This PR just places the unwrapping step before the NaN step.

Unwrapping error:

(if NaNs are set before unwrapping)

Wrapped

image

Unwrapped

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Before

Unwrapped

image

Wrapped

image

After

Unwrapped

image

Wrapped

image

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