Analogous to Fig 7, results for θ_tan= 60°: Evolution of the plane of satellite galaxies with proper motion uncertainties included in each panel. The black dashed-dotted curves represent the mean axis ratio for forward integration, while the colored dashed curves indicate the mean axis ratio for backward integration under different potential models characterized by halo mass. Specifically, the blue, green, and red dashed curves correspond to the c/a values under the MW_low, MW_fiducial, and MW_high potential models, respectively. Note that in these results we account 5% of distance uncertainties.