Connectivity variations as a function of mass and local over-density. Left: mean connectivity in the galaxy mass vs. local over-density plane. The pixel colours represent the mean number of streams in a given mass and 1 + δ_DTFE bin. The dashed grey lines show the limits of the four different galaxy populations we study in Sect. 6. Right: corresponding bootstrap errors on the means. The dark green pixels (error values of zero) need to be interpreted with caution because they represent bins with only one galaxy (see the number counts in Fig. E.1).