Fig. 4.
Intrinsic uncertainties as a function of Gaia G-band magnitude for the proper-motion component along α (lower panel) and δ (upper panel). Black-filled symbols are our HST + Gaia estimates, while grey-filled symbols are Gaia DR2 proper-motion uncertainties for sources in the direction of Draco. The red dashed line corresponds to a velocity of 10 km s−1 at the distance of Draco, roughly mimicking the system velocity dispersion.
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