Top panel: AGN. Bottom: Non-AGN. Left to right: increasing stellar mass bins. The evolution of the gas mass over the stellar mass of the galaxy at z=0 as a function of look-back time. In the two higher mass bins, there is very little difference between the environment or between the AGN and non-AGN in the build-up of gas mass. In the smallest stellar mass bin, we need to carry out some statistical tests or something similar to understand the differences.