Radial averages in M33 as a function of galactocentric distance R. From top to bottom: Star formation rate surface density, Σ_SFR, using various indicators (see Appendix D for details), the effective SFE, Σ_SFR/Σ_H2, the midplane pressures P_hy, P_BR⁰≡ P_DE^*, and P${}_{\mathit{DE}}^{\ast ,approx}$, the ratio between the stellar and gaseous pressure terms, P₂/P₁, in P_DE^* and P_hy, the stellar to gas volume density ratio ρ_s/ρ_g, the dust to total gas mass surface density ratio Σ_dust/Σ_g, the orbital, and epicyclic times t_o, t_e, and the Toomre parameter Q for a thin disk with or without considering the dark matter gravity. The gray dashed lines indicate unity ratios.