B vs. I flux variations of 3C 120 in the aperture and the residuals of the data to the linear regression. Each point is drawn as a thin cross in which the line length corresponds to the photometric uncertainties in the respective filters. The yellow cone denotes the host color range of Sakata et al. (2010). The black continuous line covers the upper and lower standard deviations in the AGN slope ΓBI, given by the OLS bisector fit. The intersection of B host flux and AGN slope is indicated by the red cross.
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