Comparison of the UGC estimated and the actual (SDSS DR16) redshifts for the 248 356 sources in common (not shown are 67 sources with actual redshift greater than 0.6). Left panel: distributions of the UGC redshifts and SDSS DR16 redshifts indicates that UGC tends to overestimate the small redshifts. Middle panel: comparison of the UGC redshifts and SDSS DR16 redshifts. The unit line is shown in red. A small horizontal branch at redshift_ugc = 0.07 is discussed in the text. Right panel: differences between the UGC and SDSS DR16 redshifts as a function of G magnitude. The red horizontal line designates perfect agreement.