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. 2022 May 9;218(4):28. doi: 10.1007/s11214-022-00895-2

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Fig. 19 — Density of interstellar neutral H as a function of distance from the Sun derived from SWAP observations. Extrapolation of H density to the upwind HTS reveals a density value that is $\sim 40 %$ larger than previous estimates. From Swaczyna et al. (2020). © AAS. Reproduced with permission