Star formation rate per unit area in units of M_⊙      yr^-1   kpc^-2 in NGC 1097: observed values (triangle) from Hsieh et al. (2011) and modelled values for the models U1 (diamond) and S2 with Ψ = 7·10^-16 (circle), see Table 1, corresponding to the models of Kawakatu & Wada (2008) and Elmegreen & Burkert (2010) with adjusted star formation efficiencies (see text). For the innermost and the outer radii the annuli have a width of 250 pc, in the region of the star burst ring the width is only 100 pc.