Spread in virial BH mass estimates for J1652 recovered from the kinematics of different broad lines (Paβ: red symbols, Hα: black symbols, Hβ: grey symbols, Mg II: blue symbols) under varying assumptions, as specified by the labels on the y-axis. In the left panel, we rescaled all virial BH masses to a common virial factor f = 1, while in the right panel the original f values from the calibrations are applied (f = 4.31 for Paβ, f = 0.75 for the Balmer lines and f = 1 for Mg II). For each line, we show the mass recovered by using the total line profile (circles) versus the broadest component of our line fit only (diamonds), and observed fluxes (open circles) versus dust-corrected ones assuming A_V = 0.89 mag (filled circles). The individual errorbars reflect the uncertainties quoted in the coefficients of the virial mass prescriptions (Eqs. (2), (3), and (4)), and we caution that they do not cover the range of BH masses obtained with our different assumptions for J1652. The vertical dashed line indicates the BH mass constraint by Perrotta et al. (2019) based on the galaxy-integrated Hβ emission in Gemini/GNIRS observations. The median log M_BH among all of our estimates is indicated by the solid vertical line, with the shaded region corresponding to ±1 standard deviation. With four open rectangles, we highlight the treatment from the original calibrations in the right panel.