Lower panel: number of low-Σ MSFGs at 0.8 ≤ z ≤ 1.0 (blue stars) with 10¹¹ M_⊙ ≤ ℳ ≤ 2 × 10¹¹ M_⊙ as a function of local density δ. For comparison, we also report the number of low-Σ MPGs at 0.5 ≤ z ≤ 0.8 (magenta squares) with 10¹¹ M_⊙ ≤ ℳ ≤ 2 × 10¹¹ M_⊙. Their values are reported on the right y-axis. The four δ bins correspond to the four quartiles of the MPG (1 + δ) distribution. Upper panel: same as in the lower panel, but for MPGs with ℳ > 2 × 10¹¹ M_⊙.