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Table A.1
List of individual spectropolarimetric observations.
| Instrument | Date (UTC) | HJD (2450000+) | ϕa |  |
 |
FAPd | <B>z [G] |
|---|---|---|---|---|---|---|---|
| HARPSpol | 2010 Jan 5 | 5201.808 | 0.340 | 99.8 | 12775 | < 10 16 | -75.4± 6.6 |
| 2010 Jan 6 | 5202.826 | 0.976 | 168.9 | 21982 | < 10 16 | -11.9 ± 3.9 | |
| 2010 Jan 7 | 5203.791 | 0.579 | 143.3 | 18337 | < 10 16 | -38.4± 4.6 | |
| 2010 Jan 8 | 5204.870 | 0.253 | 156.5 | 20156 | < 10 16 | -55.1 ± 4.2 | |
| 2010 Jan 9 | 5205.838 | 0.857 | 188.5 | 24264 | < 10 16 | -53.6 ± 3.5 | |
| 2010 Jan 10 | 5206.846 | 0.487 | 161.3 | 20723 | < 10 16 | -16.8 ± 4.1 | |
| 2010 Jan 13 | 5209.852 | 0.364 | 122.6 | 15522 | < 10 16 | -60.6 ± 5.4 | |
| 2010 Jan 14 | 5210.838 | 0.980 | 138.5 | 17543 | < 10 16 | -20.6 ± 4.8 | |
| 2010 Jan 15 | 5211.815 | 0.590 | 186.0 | 23814 | < 10 16 | -24.7 ± 3.5 | |
| 2010 Jan 16 | 5212.770 | 0.187 | 167.4 | 21421 | < 10 16 | -5.3 ± 4.0 | |
| HARPSpol | 2011 Feb 8 | 5600.662 | 0.447 | 136.9 | 16468 | < 10 16 | -12.0 ± 4.7 |
| 2011 Feb 8 | 5600.789 | 0.526 | 153.2 | 18060 | < 10 16 | -11.5 ± 4.3 | |
| 2011 Feb 9 | 5601.632 | 0.053 | 126.9 | 15068 | < 10 16 | 21.0 ± 5.1 | |
| 2011 Feb 9 | 5601.826 | 0.174 | 152.2 | 17974 | < 10 16 | -6.1 ± 4.3 | |
| 2011 Feb 10 | 5602.634 | 0.679 | 142.0 | 17160 | < 10 16 | -22.4± 4.5 | |
| 2011 Feb 10 | 5602.813 | 0.791 | 143.1 | 17043 | < 10 16 | -4.2 ± 4.5 | |
| 2011 Feb 12 | 5604.678 | 0.955 | 120.0 | 14376 | < 10 16 | 50.9 ± 5.4 | |
| 2011 Feb 12 | 5604.843 | 0.058 | 106.8 | 12827 | < 10 16 | 21.2 ± 6.0 | |
| 2011 Feb 13 | 5605.627 | 0.548 | 146.6 | 17658 | < 10 16 | -9.0 ± 4.4 | |
| 2011 Feb 13 | 5605.838 | 0.680 | 148.3 | 17670 | < 10 16 | -31.3 ± 4.4 | |
| 2011 Feb 14 | 5606.580 | 0.143 | 128.4 | 15375 | < 10 16 | -6.9 ± 5.0 | |
| 2011 Feb 14 | 5606.739 | 0.243 | 144.2 | 17101 | < 10-16 | -26.7 ± 4.5 | |
| 2011 Feb 15 | 5607.627 | 0.797 | 134.1 | 16178 | < 10-16 | -7.3 ± 4.8 | |
| 2011 Feb 15 | 5607.745 | 0.871 | 166.5 | 19834 | < 10-16 | 17.6 ± 3.9 | |
| ESPaDOnS | 2016 Jan 14 | 7402.061 | 0.523 | 216.6 | 14996 | 3.1 × 10 10 | -25.6 ± 7.6 |
| 2016 Jan 15 | 7403.016 | 0.119 | 223.5 | 15286 | 1.7 × 10 16 | -42.3 ± 7.4 | |
| 2016 Jan 16 | 7404.051 | 0.766 | 219.7 | 15271 | 4.9 × 10 10 | 2.8 ± 7.4 | |
| 2016 Jan 17 | 7405.048 | 0.388 | 233.7 | 16416 | < 10 16 | -39.6 ± 7.0 | |
| 2016 Jan 18 | 7406.044 | 0.010 | 230.3 | 15829 | < 10-16 | -13.6 ± 7.0 | |
| 2016 Jan 19 | 7407.076 | 0.655 | 231.8 | 15851 | 7.7 × 10 11 | -19.1 ± 7.1 | |
| 2016 Jan 21 | 7409.038 | 0.880 | 177.9 | 12077 | < 10 16 | 32.9 ± 9.2 | |
| 2016 Jan 22 | 7410.042 | 0.507 | 196.2 | 13353 | 5.1 × 10 13 | -44.3 ± 8.6 | |
| 2016 Jan 23 | 7411.006 | 0.109 | 245.1 | 16931 | < 10 16 | -41.8 ± 6.6 | |
| HARPSpol | 2017 Dec 13 | 8100.823 | 0.939 | 198.9 | 15661 | < 10 16 | 33.2 ± 3.2 |
| 2017 Dec 14 | 8101.835 | 0.571 | 203.9 | 16221 | < 10 16 | -32.9 ± 3.1 | |
| 2017 Dec 15 | 8102.833 | 0.194 | 218.0 | 17400 | < 10 16 | -33.0 ± 2.9 | |
| 2017 Dec 16 | 8103.833 | 0.819 | 202.0 | 15892 | < 10 16 | 56.0 ± 3.1 | |
| 2017 Dec 17 | 8104.701 | 0.361 | 184.1 | 14539 | < 10 16 | 1.0 ± 3.5 | |
| 2017 Dec 17 | 8104.822 | 0.437 | 181.9 | 14485 | < 10 16 | 5.0 ± 3.5 | |
| 2017 Dec 17 | 8104.852 | 0.455 | 141.9 | 11214 | < 10 16 | 4.4± 4.5 | |
| 2017 Dec 19 | 8106.827 | 0.689 | 95.7 | 7532 | < 10 16 | -0.1 ± 6.7 | |
| 2017 Dec 19 | 8106.857 | 0.708 | 85.5 | 6886 | < 10 16 | 25.6 ± 7.2 | |
Notes. (a)Phases ϕ calculated using the ephemeris of Eq. (3); (b)S/N of the Stokes I spectrum; (c)S/N of the Stokes V LSD profile; (d)FAP of the magnetic field detection in the Stokes V LSD profile
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