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Table 1
COS/HST log of observations for the five pulsating DB stars in the sample.
| Target | Date | Exposure [s] | Aperture | Grating | Central λ | Opt. | |
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| EC 20058-5234 | 2011-11-19 | 1100.64 | PSA | G130M | 1283.307 | 15.58 (V) | |
| 2011-11-19 | 3423.58 | PSA | G160M | 1604.309 | |||
| WD J1929+4447 | 2012-11-09 | 5182.72 | PSA | G130M | 1283.080 | 18.21 (V) | |
| 2012-11-09 | 5882.67 | PSA | G160M | 1604.282 | |||
| EC 04207-4748 | 2012-10-24 | 1419.14 | PSA | G130M | 1283.264 | 15.30 (V) | |
| 2012-10-24 | 2193.25 | PSA | G160M | 1604.418 | |||
| PG 1115+158 | 2013-02-01 | 1734.05 | PSA | G130M | 1283.322 | 16.61 (g) | |
| 2013-02-01 | 5246.78 | PSA | G160M | 1604.271 | |||
| WD 1654+160 | 2013-07-04 | 1409.08 | PSA | G130M | 1283.307 | 16.62 (g) | |
| 2013-07-04 | 2403.42 | PSA | G160M | 1609.345 | |||
Notes. The last column (opt) gives the optical photometry used for the parameter determination (Johnson V or SDSS g).
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