Left panel: colour-magnitude diagram of ED-3 (orange) and NGC 3201 stars (black) with the best-fit isochrone to ED-3 overlaid. While the colours and magnitudes have been corrected for extinction using the 2D dust maps from Schlafly & Finkbeiner (2011), we caution that there is still a substantial broadening present in the CMD of NGC 3201 due to high differential reddening. Right panel: photometric metallicities from the Andrae et al. (2023) quality giant sample as a function of absolute magnitude. A couple of ED-3 stars are similar in their photometric metallicity to NGC 3201. There are two RGB stars in common between our measured [Fe/H] and Andrae et al. (2023), and they are consistent within 0.1 dex.