Gaia EDR3 chart of the central 6′×6′ of Villafranca O-023 (Orion nebula cluster). Plotted sources are those with normalized parallaxes within 3 sigmas independently of other filters i.e., a lax selection criterion for cluster membership rather than the strict one used to select the sample in this paper. Symbol color, symbol size, and arrows encode , G′, and proper motion, respectively, according to the caption. Objects without color either have no or (more commonly) have C^* >  0.4 due to nebular contamination. The Trapezium is at the field center.