Fig. 9

Number of ionising photons required by the MB thin-shell models emitted by the ionising source for each region (solid line) and absorbed by the gas (dashed line). The black dashed line represents the input number of ionising photons of the RB thick-shell model, while the grey band is the number derived from the total Hα extinction-corrected luminosity measured by Relaño & Kennicutt (2009).
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