get_peaks_low_frequencies# ProminenceRatio.get_peaks_low_frequencies()# Get the vector of the peaks’ lower-frequency limits. Returns: : numpy.ndarrayVector of the peaks’ lower-frequency limits in Hz. Return type: Union[Buffer, _SupportsArray[dtype[Any]], _NestedSequence[_SupportsArray[dtype[Any]]], bool, int, float, complex, str, bytes, _NestedSequence[Union[bool, int, float, complex, str, bytes]]]