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Table 8
Variation of the Ca I velocity shift, b value and column density evaluated by fitting the ground base line at 4226.728 Å.
| Periods | S∕N | v | b | log NFeI |
|---|---|---|---|---|
| (yr) | (km s−1) | (km s−1) | (cm−2) | |
| 2003–2004 | 2120 | 19.80 ± 0.25 | <2.0 | 8.48 ± 0.08 |
| 2004–2007 | 870 | 21.29 ± 0.42 | <1.4 | 8.60 |
| 2007–2008 | 1200 | 19.53 ± 0.35 | <1.00 | 8.52 |
| 2008–2009 | 1980 | 19.85 ± 0.22 | 1.30 ± 0.45 | 8.69 ± 0.09 |
| 2009–2010 | 590 | 15.42 |
– | <8.25a |
| 2010–2011 | 860 | 19.56 ± 0.63 | <1.5 | 8.44 |
| 2013–2014 | 1350 | 20.08 ± 0.45 | <1.1 | 8.35 |
| 2014–2015 | 800 | 20.70 ± 0.44 | <1.6 | 8.66 ± 0.15 |
| 2015–2016 | 950 | 31.40 |
– | <8.51a |
| 2016–2017 | 1450 | 20.35 ± 0.65 | <1.1 | 8.17 |
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