m _F115W vs. m _F115W − m _F322W2 CMD for stars in field C with available proper motions (left panel). The middle panel shows F115W magnitude as a function of proper motion relative to 47 Tucanae. The vertical aqua line separates the bulk of cluster members (black points in the left and middle panels) from field stars (red crosses). Stars below the aqua horizontal line, where the proper motions do not allow us to disentangle field stars from cluster members, are represented with gray crosses. Probable white dwarfs, selected from the m _F606W vs. m _F606W − m _F115W CMD are represented with blue triangles in the left and middle panels. In the right panel we show the m _F322W2 vs. m _F115W − m _F322W2 CMD for all stars in the field CMD (gray points) with the stars simulated by the trilegal Galactic model (red starred symbols; Girardi et al. 2005) for a field with the same area as field C in the direction of 47 Tucanae.