Maser disks and posterior probability distributions for the galaxies NGC 1194, NGC 5495, and Mrk 1029. The maser disk plots show the three groups of maser features viewed edge-on with their observational error. The star symbol refers to the best fit for the BH position on the disk. The black line through this star symbol indicates the uncertainty in the position of BH. The blue graphs in the right panels show the posterior probability distribution with the contour levels corresponding to 1σ and 2σ confidence regions.