Left: available FUV heating flux (black saw-tooth line) as a function of azimuth, derived from an proposed star formation history. The proposed star formation history is indicated at the bottom of the panel (black box function). The grey lines (underlying the black) are an alternative example of a star formation history and FUV heating flux. The observed FIR (dust) flux is shown in blue/red (east/west side of the ring). Details in the text. Right: similar, except now for the [CII]+[OI] (gas) emission lines. The FoV of the Herschel spectra does not cover the full ring, thus for several apertures the gas information is lacking.
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