Ring characteristics from all bands, observational days, and imaging pipelines coming form HOPS and CASA data (colored points). Median values and 68% confidence intervals are shown for diameter and width. Circular mean and standard deviation values are shown for the position angle. Circle and triangle markers correspond to REx and VIDA respectively. Red (eht-imaging) and blue (DIFMAP) dashed lines and shaded regions show the ring parameters and 68% confidence intervals from the 2017 April 11 measurements. The vertical gray shaded region corresponds to the 2018 April 21 measurements, and the vertical un-shaded region corresponds to the 2018 April 25 measurements.