def get_lomb_amplitude_ratio(lomb_model, i):
    return (lomb_model['freq_fits'][i-1]['amplitude'][0] / 
            lomb_model['freq_fits'][0]['amplitude'][0])
Get the ratio of the amplitudes of the first harmonic for the ith and first
dataset/ETHPy150Open cesium-ml/cesium/cesium/science_features/lomb_scargle.py/get_lomb_amplitude_ratio