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Table 1
Analyzed observations.
| Observing date | Instrument | Detector | Filter/Grating | Exposure time | Wavelength range (Å) | Obs. ID. |
|
|
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| 1981 Oct. 20 | IUE | Low dispersion, short wvl. | 23.1 ks | 1150–1979 | SWP15301 | |
| 1982 Jan. 12 | IUE | Low dispersion, short wvl. | 26.4 ks | 1150–1979 | SWP16033 | |
| 1996 Feb. 08 | HST | GHRS | G160 | 16.5 ks | 1383–1417 | 5875 |
| 1999 Jan. 14 | HST | STIS | G750M | 16.5 ks | 6300–6870 | 7311 |
| 2000 Oct. 22 | HST | STIS | E140M | 2.7 ks | 1123–1710 | 8157 |
| 2011 Feb. 17 | HST | STIS FUV-MAMA | G140M | 14.0 ks | 1514–1567 | 12199 |
| 2011 Jul. 23 | HST | ACS SBC | F140LP | 1.9 ks | 1350–2000 | 12199 |
| 2011 Jul. 23 | HST | ACS SBC | F150LP | 1.9 ks | 1450–2000 | 12199 |
| 2011 Jul. 23 | HST | ACS SBC | F165LP | 1.9 ks | 1600–2000 | 12199 |
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