Accuracy of our BH mass measurement. Top: output BH masses compared to the input BH masses. Bottom: the difference between output and input BH masses (﹩{\rm{\Delta }}\mathrm{log}{M}_{{\rm{BH}}}=\mathrm{log}{M}_{{\rm{BH}},{\rm{output}}}-\mathrm{log}{M}_{{\rm{BH}},{\rm{input}}}﹩) compared to the input BH masses. Colored data points denote sources with SNR_Hα,broad > 5 while gray circles represent those with lower SNR. The color of each data point denotes the input magnification for our sources. The circles represent the mean values of data points in each 0.3 dex bin of the output M_BH. The black dashed line denotes the 1:1 line, and the black dotted lines represent 0.3 dex.