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Table 1.
Observation information for all epochs.
| Epoch | Obs. date | Instrument | Grating | Exp |
|---|---|---|---|---|
| 1999 | 1999/12/06 | FUSE | FUV | 37.6 ks |
| 2002 | 2002/12/13 | FUSE | FUV | 7.0 ks |
| 2002/12/13 | HST:STIS | E140M | 13.0 ks | |
| 2004 | 2004/06/21 | HST:STIS | E140M | 22.8 ks |
| 2010 | 2010/10/16 | HST:COS | G130M | 2.1 ks |
| G160M | 2.4 ks | |||
| 2015_v1 (a) | 2015/06/12 | HST:COS | G130M | 2.2 ks |
| G160M | 2.4 ks | |||
| 2015_v2 (b) | 2015/11/24 | HST:COS | G130M | 2.2 ks |
| G160M | 2.4 ks | |||
| 2015_v3 (b) | 2015/12/15 | HST:COS | G130M | 2.2 ks |
| G160M | 2.4 ks | |||
| 2015_v4 (b) | 2015/12/22 | HST:COS | G130M (c) | 12.9 ks |
| 2015_v5 (b) | 2015/12/23 | HST:COS | G130M | 2.2 ks |
| G160M | 2.4 ks | |||
| 2015_v6 (b) | 2015/12/25 | HST:COS | G130M | 2.2 ks |
| G160M | 2.4 ks | |||
| 2015_v7 (b) | 2015/12/26 | HST:COS | G130M | 2.2 ks |
| G160M | 2.2 ks | |||
| 2015_v8 (b) | 2015/12/27 | HST:COS | G130M (c) | 10.2 ks |
| 2015_v9 (b) | 2015/12/29 | HST:COS | G130M | 2.2 ks |
| G160M | 2.4 ks |
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