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Table 1

Previous models based on in situ and radio science measurements (see text for detailed descriptions).

Spacecraft Data type Author

Mariner 6 and 7 radio science Muhleman et al. (1977)
Voyager 2 radio science Anderson et al. (1987)
Ulysses radio science Bird et al. (1994)
Helios land 2 in situ Bougeret et al. (1984)
Ulysses in situ Issautier et al. (1998)
Skylab Coronagraph Guhathakurta et al. (1996)
Wind solar radio Leblanc et al. (1998)
burst III

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