Table 4: Systematic uncertainty contributors on the distance of RS Pup.
Term Value $\sigma_{\rm syst}$

Pixel scale
$0.1665 \pm 0.0006^{\prime\prime}$ 0.4%

Position of RS Pup
$\pm $0.2 pixel 0.3%

Reference epoch
${\rm MJD}~54090.836 \pm 0.08$ 0.2%

Photometric period
$41.4389 \pm 0.02~{\rm days}$ 0.2%

Choice of features
$\pm 16$ pc (see text) 0.8%
Total $\pm $20 pc 1.0%


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