Stellar and gas masses as a function of environment. Top panel: The solid black line and the shaded regions correspond to the median of the distribution for central galaxies and the 16th and 84th percentiles, respectively. The dashed and dotted lines represent central galaxies in haloes residing in the 20% most and least dense environments, respectively. The environmental classification is based on the individual bias-per-object and is performed in logarithmic bins of halo mass. Bottom panel: The same comparison is shown for gas mass normalised by peak subhalo mass.