Fig. 3
The ΣSFR – F[ NII] 205 correlation superimposed on the predictions from the Starburst99 model. For varying values of ε, the dashed lines correspond to a stellar population with a constant SFR and td = 2 Myr, and solid lines correspond to td ≥ 20 Myr. The dash-dotted line is the best-fitting linear relation from the M 51 and NGC 891 data.
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