Same as Fig. 2, but for M_⋆ binned stacks. The ranges of M_⋆ used in each stacks are shown in each cutouts (in log solar masses). While we obtained strong detections from most of the stacked images, in the lower mass bin of z ∼ 5.5 galaxies, only a ∼2σ peak is present at the source position. This is lower than our detection threshold for individual images, therefore we provide a conservative 3σ upper limit for this bin (see text).