Integrated optical depth as a function of principal quantum number, 𝗇, for the hydrogen RRLs detections associated with the −47 km s−1 velocity component toward Cas A. The figure shows the values from Table 2 using 3σ error bars. The blue solid line shows the best-fit model. The red dotted line shows the best-fit model (O17) to carbon RRL detections spanning quantum numbers 225–550 (e.g., see Fig. 10).
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