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| Observatory | N |  |
HJD begin | HJD end | Filter(s) | f1 |
| La Silla | 20 | 186.7 | 50 562.8 | 50749.6 | UB1BB2V1VG | 5.4870(2) |
| La Palma | 171 | 11 83.8 | 52 421.6 | 53605.4 | UB1BB2V1VG | 5.48693(1) |
| SPMO | 113 | 5.3 | 53 192.7 | 53 198.0 | u,v,b,y | 5.494(3) |
| SNO | 222 | 359.2 | 53 205.4 | 53 564.6 | u,v,b,y | 5.48693(3) |
| KO | 84 | 319.2 | 53 260.3 | 53 579.5 | Johnson V | 5.49(1) |
| KO CCD | 261 | 26.1 | 53 921.4 | 53 947.5 | Johnson V | 5.4858(3) |
| ASAS | 363 | 2797.6 | 51 979.9 | 54 777.5 | Johnson V | 5.486915(7) |
| Strömgren | 335 | 371.9 | 53 192.7 | 53564.6 | u,v,b,y | 5.48693(2) |
| U | 526 | 3042.6 | 50 562.8 | 53 605.4 | U, u | 5.48695(2) |
| B | 526 | 3042.6 | 50 562.8 | 53 605.4 | B, v | 5.486947(2) |
| V | 526 | 3042.6 | 50 562.8 | 53 605.4 | V, y | 5.486944(2) |
| V+ | 1234 | 4214.7 | 50 562.8 | 54 777.5 | V, y, V | 5.486938(5) |
The number N of datapoints retained for the analysis, the total timespan
(in days) and the available filters are given. The last column gives the value of the dominant frequency (see Sect. 2.2) expressed in d-1 with its error between brackets. The HJD is given with respect to
 .
Strömgren refers to merged SPMO and SNO Strömgren data. The merged Geneva U and Strömgren u, B and v, and V and y data, are denoted as
U, B, V data, respectively. The V+ dataset corresponds to the V data to which the KO Johnson V data and ASAS Johnson V data are also added.
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