Posterior distribution of the M87 ring diameter, thickness, and ellipticity estimated from 100 resolve posterior sample images. Contours show 1σ and 2σ cumulative regions. The probability density function is obtained using Gaussian kernel density estimation. Each black dot marks the estimated ring parameter from the resolve posterior sample images. The red marks correspond to the estimation of the ring diameter and ring thickness obtained by the DoG-HiT reconstruction (diameter: 61.0 μas, thickness: 20.6 μas, ellipticity: 0.04).