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Table 2
Set of calibration stars observed regularly to guarantee the correct transformation of the TIGRE S-index into the Mount Wilson S-index.
| HD 69201 | HD 329232 | HD 897441 | HD 131156A1 |
| HD 103072 | HD 352962 | HD 957351 | HD 1371071 |
| HD 107001 | HD 373941 | HD 973341 | HD 1423731 |
| HD 134211 | HD 395872 | HD 1005631 | HD 1586141 |
| HD 166731 | HD 413302 | HD 1015011 | HD 1593321 |
| HD 179251 | HD 428072 | HD 1065161 | HD 1825721 |
| HD 193732 | HD 435872 | HD 1143781 | HD 1903601 |
| HD 220491 | HD 450671 | HD 1150431 | HD 2010910 |
| HD 220721 | HD 614211 | HD 1153831 | HD 2079781 |
| HD 232491 | HD 729051 | HD 1156171 | HD 2163851 |
| HD 259981 | HD 753321 | HD 1245701 | HD 2170141 |
| HD 269231 | HD 755282 | HD 1248501 | |
| HD 304951 | HD 824431 | HD 1293331 |
Reference. (0) Extrapolated from time series, corresponding period from Baliunas et al. (1995); (1) Baliunas et al. (1995); and (2) Hall (priv. comm.).
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