Gaia eDR3 photometry and astrometry of η Cha. Top: colour-magnitude diagram of the η Cha association members from Gaia eDR3 photometry. The isochrones are overplotted and the determined x² values are shown in the legend, each with p values > 9e6. The confirmed binaries, as indicated in Table A.1 are not included in the x² calculations. Bottom: proper motion plot from Gaia eDR3 astrometry. Markers are color-coded by the star’s parallax (see color bar at right). RX J1005 (−38,15) and J0801 (−19,29) are not shown.