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|doi-access=free }} Using further analysis, this gives a refined figure of {{val|149598845|250|u=km}}.</ref> Once the correct value was known, other groups found echos in their archived data that agreed with these results.<ref name="SP4218"/>
The Sun has been detected several times starting in 1959. Frequencies are usually between 25 and 38
The following is a list of planetary bodies that have been observed by this means:
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