Comparing the angular diameter fit using four-way data (top half) from 2005 with that of six-way data from 2021 (bottom half) for HD 187929/η Aql. The symbols are the same as in Figure 2, while bottom portion of each half shows the residuals to the angular diameter fit. The four-way data had three siderostats per spectrograph, while the six-way data had four siderostats per spectrograph, which partially accounts for the increased scatter in the residuals for the latter.