def _set_frequency_spacing(self, min_freq, max_freq):
self.frequency_spacing = np.linspace(min_freq, max_freq, num=self._sheet_dimensions[<NUM_LIT:0>]+<NUM_LIT:1>, endpoint=True)<EOL>
Frequency spacing to use, i.e. how to map the available
frequency range to the discrete sheet rows.

NOTE: We're calculating the spacing of a range between the
highest and lowest frequencies, the actual segmentation and
averaging of the frequencies to fit this spacing occurs in
_getAmplitudes().

This method is here solely to provide a minimal overload if
custom spacing is required.