Average Eddington ratio of BHs in the M_BH − M_* plane (color-coded). The blue data are taken from Savorgnan & Graham (2016), and the red squares and triangles are the data obtained from reverberation mapping and maser techniques, respectively. These are taken from van den Bosch (2016). To the error bars reported by the latter authors (referring to measurement errors in the K-band magnitude), we have added (in quadrature) a systematic error estimate of 0.3 dex corresponding to the uncertainties in the conversion from k-band magnitudes to stellar masses.