Mass function of the two stellar populations of 47 Tuc. The top panel shows the MF derived under the hypothesis that all the stars either belong to the 1G (blue dots) or belong to the 2G (red dots) of the cluster. The bottom panel reports the MF based on the assumption that 40% of 47 Tuc stars belong to the 1G. This percentage increases to 46% for F322W2 > 21. Both MFs are consistent with a Kroupa-like profile with slope 1.1 down to masses ~0.22 M_⊙, then stay constant until the very low-mass domain.