Toomre Q parameter as a function of cloud radius (r_cloud). The Toomre Q is defined as Q = σ_vκ/πGΣ where σ_v = 1km s^-1, Σ is the ring-averaged column density and κ is the epicyclic frequency. The resolution of the plot is 2.7 pc (limited by the size of the rings). It is indicated as the blue horizontal bar. The central 5 pc is dominated by the central clump. This is indicated by the vertical red dashed line.