Left: M4 CMD in the inner three annuli. Right: CMD of noncluster stars (largely inner halo) in the direction of M4 from the three inner annuli. This inner halo main sequence is compared with the M4 fiducial (the fiducial has been extended to brighter magnitudes using ground‐based data) and the isochrones (bluest at low luminosity) interpolated to the derived metallicity and both shifted to a distance modulus of 3.2 mag larger than that of the cluster.