Gas fraction of halos, taken as the ratio of gas mass to total mass, both within a 3D aperture of R_500c. We compare to observational inferences derived from X-ray emission (Giodini et al. 2009; Gonzalez et al. 2013; Lovisari et al. 2015, 2020), measurements of the kinetic Sunyaev-Zeldovich effect (Tanimura et al. 2021). In all three cases, in lieu of detailed mock observations enabling an apples-to-apples evaluation, this is a qualitative, face-value comparison only. For this purpose, the green and purple solid curves are the running averages from the recent MTNG and FLAMINGO simulations.