Gaia EDR3 proper motions (Gaia Collaboration 2021) and photogeometric distances (Bailer-Jones et al. 2021) of presumed member stars of NGC 3603 identified in Table B.1. Left panel: proper motions in right ascension μ_α and in declination μ_δ. Objects depicted as full symbols satisfy our selection criteria, while those marked by empty symbols are excluded for high RUWE values >1.3 or constraints in proper motion. Right panel: distribution of inferred distances towards NGC 3603. The BSGs in the inner NGC 3603 field (Sher 25, Sher 23, and Sher 18) are marked in both panels.