Fig. 5.
Selection of Eridanus 2 member stars based on photometric cuts with a broadened isochrone. The broadened isochrone has been constructed from 7 to 9 Gyr isochrones from the MESA Isochrones & Stellar Tracks project with a metallicity spread based on previous observations. Stars are rejected if they are inconsistent with the broadened isochrone at a 3-σ level according to their photometric measurements and uncertainties. Two stars with F606W − F814W ≈ 2.0 and F606W ≈ 25 are not shown in order to facilitate a more detailed view of the colour-magnitude space around the broadened isochrone.
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