On the left, the ellipse marks the proper motion selection criteria for the probable members (black dots) of RCW 36 from Ellerbroek et al. (2013); Broos et al. (2013); the grey dots are the sources from Gaia DR3 (Gaia Collaboration 2016, 2023) in the 10′-radius field around the central position of RCW 36. On the right, the sources selected based on the parallax and proper motion criteria (red dots; see Section 4); black dots with grey error-bars represent the parallax and the corresponding uncertainties of the sources in the 10′ field.