JWST CMD of NGC 6440 including only bona-fide member stars. The red curve is a 13 Gyr BaSTI isochrone reproducing a [α/Fe]= + 0.4 stellar population with a metallicity [Fe/H] = −0.6 and a He fraction Y = 0.257, representative of the FP. The blue curve is an isochrone computed at the same age and metallicity as the previous one, but with a He fraction Y = 0.3 and a solar-scaled (O/Fe = +0.0) chemical mixture, thus making it representative of the SP.