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The pwr_cal::get_gain() method previously held the incorrect assumption
that power values per frequency would be equidistant, i.e., be at the
same indices as the gain values. Due to the frequency-dependent nature
of the hardware, this is not a valid assumption (if that were the case,
frequency-dependent calibration would be unnecessary).
This changes get_gain() to not rely on that assumption. Note that it
requires doing some more rounding: The bilinear interpolation method
uses requires coordinates to be on a rectangular grid. This snaps the
power values onto a single coordinate.
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