Conditional co-occurrence of physical mechanisms per stellar mass bin, split by environment. Top: Halo-based classification. Bottom: 2D observational-like classification. Each cell shows the fraction of galaxies experiencing the second process given the first one: the cell color represents the overall fraction across all environments, the four corners indicate the fractions in isolated (top-left), pairs (top-right), filaments (bottom-left), and groups (bottom-right). Only the upper triangle is displayed, as co-occurrence is symmetric.