Fig. 4.
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Histogram of the S/N of the PMa signal from Gaia DR2 (light grey), the stars presenting a PMa S/N > 3 both in DR2 and EDR3 (medium blue), the stars with a PMa S/N > 3 only in DR2 (hatched light blue), and the stars with a PMa S/N > 3 only in the EDR3 (green). Right panel: corresponding fraction of the stars in the total sample per S/N bin.
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