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Table 1.
Main characteristics of the different types of systematic variability found in the data.
| Type | Origin | Dep. | Duration | Periodicity |
|---|---|---|---|---|
| I SRV | Instrumental | SE | weeks | annual |
| IIa SRV | Unknown | SE | months | annual |
| IIb SRV | Unknown | SE | months | semi-annual |
| TDV | Unknown | Time | weeks | semi-annual |
Notes. The acronym SE in the dependency (Dep.) column indicates solar elongation.
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