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Caption: Figure A1.
OGLE-2017-BLG-0406 parallax contours for the W+ solution after the removal of the last six Spitzer data points from 2017. Hence, the elliptical contours from the ground-only fit in the left panel are identical to those of Figure 2. The Spitzer arc looks qualitatively similar, but there is a single minimum near ﹩{\pi }_{{\rm{E}},N}\sim 0﹩ rather than two weak, roughly symmetric minima at ﹩\pm {\pi }_{{\rm{E}},N}﹩. Nevertheless, in both cases, the two sets of contours overlap at 1σ. The colored contours at the right show the product of the two sets of likelihood contours from the left. The white contours are from the full fit to all the data (i.e., they are the same as in Figure 2). Thus comparison of the white and colored contours shows that the solution changes by ﹩\lt 1\sigma ﹩.
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