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Table 4
Properties of the FeI gas over the different epochs of observations, evaluated by fitting simultaneously the two absorption lines from the ground state (3859.30 and 3859.70 Å) with a single component.
| Periods | Nb. | v | b | log NFeI |
|---|---|---|---|---|
| (yr) | Obs. | (km s−1) | (km s−1) | (cm−2) |
| 2003–2004 | 215 | 20.15 ± 0.01 | 0.73 ± 0.02 | 12.418 ± 0.002 |
| 2004–2007 | 42 | 20.16 ± 0.02 | 0.81 ± 0.06 | 12.398 ± 0.005 |
| 2007–2008 | 198 | 20.20 ± 0.01 | 0.84 ± 0.04 | 12.383 ± 0.004 |
| 2008–2009 | 417 | 20.21 ± 0.01 | 0.77 ± 0.02 | 12.427 ± 0.002 |
| 2009–2010 | 54 | 20.22 ± 0.02 | 0.58 ± 0.13 | 12.408 ± 0.020 |
| 2010–2011 | 207 | 20.24 ± 0.02 | 0.93 ± 0.05 | 12.401 ± 0.005 |
| 2013–2014 | 453 | 20.14 ± 0.01 | 0.87 ± 0.03 | 12.258 ± 0.004 |
| 2014–2015 | 60 | 20.18 ± 0.02 | 0.85 ± 0.07 | 12.253 ± 0.007 |
| 2015–2016 | 190 | 20.16 ± 0.02 | 0.47 ± 0.08 | 12.215 ± 0.010 |
| 2016–2017 | 1080 | 20.20 ± 0.01 | 0.40 ± 0.05 | 12.328 ± 0.015 |
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