Radial profiles of galaxies, galaxy properties, and physical properties of the underlying dark matter, gas, and stars, centered on the most massive halo in the zFIRE protocluster region. Left: Median distribution of the number of surrounding galaxies, plus their sSFR, gas fraction, and ⟨g − r⟩ color, including galaxies with M_⋆ > 10⁸ M_⊙. The virial radii of the main zFIRE halo are indicated by the vertical dashed lines. Right, top panel: Radial density profiles for dark matter, gas, and stars. Right, bottom three panels: Neutral hydrogen density, temperature, and metallicity radial profiles. Each colored line shows another variation run, while the black line shows their median.