Changes of core size of OH 471 over time. A dashed line represents the average core size (0.30 ± 0.11 mas) from 8-GHz VLBI observations. Notably, three data points showing a core size greater than 0.4 mas are linked to observations with limited (u, v) coverage, where only the core, lacking any jet structure, was detected. This observational limitation influences the measured core sizes.