Fig. 6
Average intensity in 2 kpc-wide rings in the plane of M 101 of I and the emission components NTH, TH and PI plotted against galacto-centric radius. For clarity, intensities of TH are halved. Errors are standard deviations. Note the change in the slopes near R=16 kpc. Dashed lines show the fits giving the exponential radial scale lengths listed in Table 4.
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