Comparison of the astrometric uncertainties for DR2, EDR3 and GOG. Due to deficiencies in the GOG Gaia error model, the astrometric uncertainties in GOG do not match perfectly those for EDR3. The error model retrieves unique values of the formal uncertainties as a function of G, while alarge range is obtained for the data (shaded areas showing the 10 and 90% percentiles). We also see an overestimation of the parallax errors (top), which actually look more similar to the DR2 scenario than to EDR3. By definition, the errors in and μ_δ are the same for GOG. The errors of the proper motions are closer to the true uncertainties although no distinction between the different components is made for this mock data.