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Table 1
Observations used to estimate the parameters.
| EPM2010 | EPM2019 | |||
|---|---|---|---|---|
| Type | Radio | Optics | Radio | Optics |
| normal points | observations | normal points | observations | |
| Interval | 1961–2009 | 1913–2009 | 1961–2017 | 1913–2013 |
| Number | 7229 | 57788 | 51858 | 72849 |
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