Fig. 5
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Left: best-fit free-free optical depth at 145 MHz. The integrated values for the regions labelled 1–14 are shown in Table 2. Right: best-fit free-free optical depth at 54 MHz. The integrated values for the regions labelled 21–70 are shown in Table 3. The region within the white box corresponds to the inset plotted in Fig. 7.
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