Maser disk and posterior probability distribution for the galaxy NGC 1320. The maser disk plot shows an AGN with particular characteristics. NGC 1320 does not have a systemic maser feature group, and the model allows for the estimation of four parameters. The star symbol in the left panel indicates the best fit for the BH position on the disk, and the black line through this symbol denotes the uncertainty in the BH position. The blue graph in the right panel shows the posterior probability distribution, with the contour levels corresponding to 1σ and 2σ confidence regions.