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Fig. 8.
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Spectra of the selected H II regions in M 101. The solid lines of different opacity correspond to fits for the free–free absorption model (combined Eq. (1) and (2)) in different areas within which the flux is measured, with diameters from 30 to 60″ with a 10″ step. The fit parameters for the 30″ area are in Table 4.
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