Relationships
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In this section, we examine the calibration of the fundamental  $R$–$L$ relationship using various luminosity measures. The analysis in this section is based only on the RMDB sample in Table A1 because all these sources have been corrected for host-galaxy starlight. To obtain accurate masses from , contaminating starlight from the host galaxy must be accounted for in the luminosity measurement, or the mass will be overestimated. For reverberation-mapped sources, this has been done by modeling unsaturated images of the AGNs obtained with the [*Hubble Space Telescope*]{} [@Bentz06a; @Bentz09a; @Bentz13]. The AGN contribution was removed from each image by modeling the images as an extended host galaxy plus a central point source representing the AGN. The starlight contribution to the reverberation-mapping spectra is determined by using simulated aperture photometry of the AGN-free image. In the left panel of Figure \[Figure:HbRL\], we show the  lag as a function of the AGN continuum with the host contribution removed in each case. This essentially reproduces the result of [@Bentz13] as small differences are due solely to improvements in the quality and quantity of the RM database \[cf. Table A1\]; we give the best-fit values to equation (\[eq:powerlaw\]) in the first row 