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Table A.1

Log of spectropolarimetric observations of the six stars.

Star Date HJD Rotational σLSD × 10-5 Bz
(UTC) (2 400 000+) phase (G)

EK Dra 2007 Jan. 25 54 126.7763 0.000 14.6 32.0 ± 9.0
EK Dra 2007 Jan. 26 54 127.7412 0.371 13.4 10.8 ± 8.1
EK Dra 2007 Jan. 27 54 128.7197 0.747 12.4 20.0 ± 7.7
EK Dra 2007 Jan. 28 54 129.7183 0.132 10.2 8.6 ± 6.2
EK Dra 2007 Jan. 29 54 130.7125 0.514 16.3 30.1 ± 9.9
EK Dra 2007 Feb. 01 54 133.7454 0.680 11.8 7.2 ± 7.3
EK Dra 2007 Feb. 02 54 134.7298 0.059 11.0 9.6 ± 6.8
EK Dra 2007 Feb. 03 54 135.7418 0.448 10.3 25.9 ± 6.2
EK Dra 2007 Feb. 18 54 150.6318 0.175 13.9 1.9 ± 8.4
EK Dra 2007 Feb. 21 54 153.6019 0.318 11.2 9.9 ± 6.9
EK Dra 2007 Feb. 22 54 154.6318 0.714 11.5 13.8 ± 7.0

EK Dra 2012 Jan. 11 55 938.7569 0.916 9.7 4.7 ± 5.9
EK Dra 2012 Jan. 12 55 939.7327 0.291 10.4 19.6 ± 6.3
EK Dra 2012 Jan. 13 55 940.7212 0.671 12.0 40.5 ± 7.4
EK Dra 2012 Jan. 14 55 941.7209 0.056 12.0 7.2 ± 7.3
EK Dra 2012 Jan. 15 55 942.7082 0.435 12.6 12.9 ± 7.6
EK Dra 2012 Jan. 16 55 943.6905 0.813 15.9 10.7 ± 9.8
EK Dra 2012 Jan. 17 55 944.6852 0.196 11.8 13.2 ± 7.2
EK Dra 2012 Jan. 22 55 949.7484 0.143 10.9 16.5 ± 6.6
EK Dra 2012 Jan. 23 55 950.7116 0.514 12.0 12.7 ± 7.3
EK Dra 2012 Feb. 08 55 966.5584 0.608 12.6 6.0 ± 7.7

HN Peg 2007 Jul. 27 54 309.5950 0.000 3.3 1.1 ± 1.1
HN Peg 2007 Jul. 28 54 310.6025 0.219 4.5 1.3 ± 1.5
HN Peg 2007 Jul. 29 54 311.5604 0.427 5.0 10.7 ± 1.7
HN Peg 2007 Jul. 30 54 312.5472 0.642 4.7 4.3 ± 1.6
HN Peg 2007 Jul. 31 54 313.5484 0.859 6.4 0.7 ± 2.2
HN Peg 2007 Aug. 02 54 315.5547 0.296 5.0 1.9 ± 1.7
HN Peg 2007 Aug. 03 54 316.5511 0.512 5.0 9.5 ± 1.7
HN Peg 2007 Aug. 04 54 317.5527 0.730 6.2 5.1 ± 2.1
HN Peg 2007 Aug. 08 54 321.5255 0.594 5.4 10.3 ± 1.8
HN Peg 2007 Aug. 09 54 322.5454 0.815 9.1 1.8 ± 3.1
HN Peg 2007 Aug. 10 54 323.5454 0.033 6.9 0.0 ± 2.3
HN Peg 2007 Aug. 14 54 327.5349 0.900 5.7 4.5 ± 1.9
HN Peg 2007 Aug. 17 54 330.5247 0.550 5.0 12.4 ± 1.7
HN Peg 2007 Aug. 18 54 331.4815 0.758 4.9 1.2 ± 1.6

HN Peg 2008 Aug. 10 54 689.5325 0.595 5.4 3.2 ± 1.8
HN Peg 2008 Aug. 12 54 691.5126 0.026 4.9 4.0 ± 1.6
HN Peg 2008 Aug. 17 54 696.5413 0.119 7.5 3.0 ± 2.5
HN Peg 2008 Aug. 19 54 698.6085 0.568 5.7 5.1 ± 1.9
HN Peg 2008 Aug. 20 54 699.5700 0.777 4.9 7.5 ± 1.7
HN Peg 2008 Aug. 21 54 700.4991 0.979 7.0 0.6 ± 2.4
HN Peg 2008 Aug. 22 54 701.4546 0.187 9.9 4.1 ± 3.3
HN Peg 2008 Aug. 23 54 702.5291 0.420 4.2 0.2 ± 1.4
HN Peg 2008 Aug. 24 54 703.5005 0.632 4.2 2.5 ± 1.4
HN Peg 2008 Aug. 25 54 704.5531 0.860 4.4 3.1 ± 1.5

HN Peg 2009 Jun. 01 54 984.6341 0.748 5.9 5.5 ± 2.0
HN Peg 2009 Jun. 02 54 985.6335 0.965 5.5 1.4 ± 1.8
HN Peg 2009 Jun. 03 54 986.6306 0.182 5.3 4.7 ± 1.8
HN Peg 2009 Jun. 12 54 995.6157 0.135 17.3 7.8 ± 5.8
HN Peg 2009 Jun. 19 55 002.6326 0.660 14.7 7.8 ± 4.9
HN Peg 2009 Jun. 22 55 005.6399 0.314 6.0 3.2 ± 2.0
HN Peg 2009 Jun. 23 55 006.6102 0.525 6.7 5.8 ± 2.2
HN Peg 2009 Jun. 27 55 010.5685 0.386 6.2 1.7 ± 2.1

HN Peg 2009 Jun. 30 55 013.5983 0.044 5.9 4.0 ± 2.0
HN Peg 2009 Jul. 05 55 018.6589 0.144 11.1 3.3 ± 3.8

HN Peg 2010 Jun. 21 55 369.5907 0.434 6.1 13.8 ± 2.0
HN Peg 2010 Jul. 04 55 382.6157 0.265 4.8 6.9 ± 1.6
HN Peg 2010 Jul. 06 55 384.5849 0.693 4.8 5.3 ± 1.6
HN Peg 2010 Jul. 07 55 385.5330 0.900 4.8 3.6 ± 1.6
HN Peg 2010 Jul. 10 55 388.5557 0.557 5.6 9.7 ± 1.9
HN Peg 2010 Jul. 12 55 390.5612 0.993 7.3 2.7 ± 2.4
HN Peg 2010 Jul. 13 55 391.5437 0.206 8.3 2.1 ± 2.8
HN Peg 2010 Jul. 14 55 392.5666 0.429 5.6 5.7 ± 1.9
HN Peg 2010 Jul. 18 55 396.4859 0.281 4.9 2.3 ± 1.6
HN Peg 2010 Jul. 23 55 401.5610 0.384 4.6 9.9 ± 1.5
HN Peg 2010 Aug. 02 55 411.5104 0.547 5.7 8.3 ± 1.9
HN Peg 2010 Aug. 07 55 416.5619 0.645 5.2 4.6 ± 1.7
HN Peg 2010 Aug. 20 55 429.5471 0.468 7.3 10.8 ± 2.4

HN Peg 2011 Jul. 11 55 754.5901 0.129 7.6 2.3 ± 2.5
HN Peg 2011 Jul. 21 55 764.6140 0.308 5.3 2.9 ± 1.7
HN Peg 2011 Jul. 22 55 765.5798 0.518 5.4 7.7 ± 1.8
HN Peg 2011 Aug. 08 55 782.5125 0.199 6.4 5.6 ± 2.1
HN Peg 2011 Aug. 10 55 784.5154 0.635 6.2 4.0 ± 2.1
HN Peg 2011 Aug. 11 55 785.5713 0.864 5.7 16.0 ± 1.9
HN Peg 2011 Aug. 15 55 789.5906 0.738 6.3 3.1 ± 2.1
HN Peg 2011 Aug. 16 55 790.5309 0.943 5.9 7.1 ± 1.9

HN Peg 2013 Sep. 09 56 545.5301 0.073 4.9 2.5 ± 1.6
HN Peg 2013 Sep. 09 56 545.6705 0.103 4.8 3.7 ± 1.6
HN Peg 2013 Sep. 10 56 546.5378 0.292 5.7 1.5 ± 1.9
HN Peg 2013 Sep. 10 56 546.5769 0.300 5.9 3.1 ± 2.0
HN Peg 2013 Sep. 10 56 546.6711 0.321 5.1 3.7 ± 1.7
HN Peg 2013 Sep. 11 56 547.5290 0.507 5.7 9.0 ± 1.9
HN Peg 2013 Sep. 11 56 547.6715 0.538 4.7 10.7 ± 1.5
HN Peg 2013 Sep. 12 56 548.5379 0.727 3.9 5.0 ± 1.3
HN Peg 2013 Sep. 12 56 548.5787 0.736 3.6 2.3 ± 1.2
HN Peg 2013 Sep. 12 56 548.6717 0.756 3.3 2.3 ± 1.1
HN Peg 2013 Sep. 14 56 550.5609 0.166 5.6 7.1 ± 1.8
HN Peg 2013 Sep. 14 56 550.6727 0.191 6.9 7.5 ± 2.3
HN Peg 2013 Sep. 15 56 551.6320 0.399 5.9 1.9 ± 2.0
HN Peg 2013 Sep. 15 56 551.6920 0.412 6.8 1.5 ± 2.3

π1 Uma 2007 Jan. 21 54 122.4826 0.000 16.7 21.0 ± 6.8
π1 Uma 2007 Jan. 26 54 127.5046 0.025 6.7 11.4 ± 2.7
π1 Uma 2007 Jan. 27 54 128.5114 0.230 4.3 4.2 ± 1.8
π1 Uma 2007 Jan. 29 54 130.5058 0.637 3.7 0.2 ± 1.5
π1 Uma 2007 Feb. 01 54 133.5353 0.256 5.0 4.7 ± 2.0
π1 Uma 2007 Feb. 02 54 134.5044 0.453 5.5 3.4 ± 2.2
π1 Uma 2007 Feb. 03 54 135.5271 0.662 5.1 10.5 ± 2.1
π1 Uma 2007 Feb. 04 54 136.4970 0.860 4.7 0.9 ± 1.9
π1 Uma 2007 Feb. 06 54 138.4632 0.261 8.8 1.4 ± 3.6
π1 Uma 2007 Feb. 07 54 139.4554 0.464 9.6 5.6 ± 4.0
π1 Uma 2007 Feb. 08 54 140.5101 0.679 5.8 6.1 ± 2.4
π1 Uma 2007 Feb. 09 54 141.5087 0.883 6.6 5.2 ± 2.7

χ1 Ori 2007 Jan. 26 54 127.4023 0.000 5.0 2.2 ± 1.7
χ1 Ori 2007 Jan. 27 54 128.3749 0.191 4.3 4.6 ± 1.4
χ1 Ori 2007 Jan. 29 54 130.3697 0.584 3.0 1.3 ± 1.0
χ1 Ori 2007 Feb. 01 54 133.3883 0.178 3.6 0.4 ± 1.2
χ1 Ori 2007 Feb. 02 54 134.3617 0.370 9.0 1.8 ± 3.1
χ1 Ori 2007 Feb. 03 54 135.3646 0.567 3.0 1.5 ± 1.0
χ1 Ori 2007 Feb. 04 54 136.3580 0.763 3.3 1.1 ± 1.1

χ1 Ori 2007 Feb. 06 54 138.3566 0.156 10.6 3.0 ± 3.6
χ1 Ori 2007 Feb. 08 54 140.3746 0.554 3.6 2.0 ± 1.2

χ1 Ori 2008 Jan. 21 54 487.3425 0.854 4.3 2.1 ± 1.4
χ1 Ori 2008 Jan. 21 54 487.3590 0.858 3.5 1.1 ± 1.2
χ1 Ori 2008 Jan. 22 54 488.3602 0.055 5.7 3.0 ± 1.9
χ1 Ori 2008 Jan. 23 54 489.3612 0.252 4.0 1.6 ± 1.3
χ1 Ori 2008 Jan. 24 54 490.3819 0.453 4.6 4.4 ± 1.5
χ1 Ori 2008 Jan. 25 54 491.3651 0.646 3.8 1.0 ± 1.3
χ1 Ori 2008 Jan. 26 54 492.3645 0.843 4.2 3.1 ± 1.4
χ1 Ori 2008 Jan. 27 54 493.3772 0.042 3.9 1.4 ± 1.3
χ1 Ori 2008 Jan. 28 54 494.4366 0.251 4.2 1.9 ± 1.4
χ1 Ori 2008 Jan. 29 54 495.3889 0.438 3.3 7.5 ± 1.1
χ1 Ori 2008 Feb. 02 54 499.3847 0.225 3.2 0.3 ± 1.1
χ1 Ori 2008 Feb. 04 54 501.3678 0.615 3.2 6.6 ± 1.1
χ1 Ori 2008 Feb. 05 54 502.3709 0.813 3.6 1.1 ± 1.2
χ1 Ori 2008 Feb. 06 54 503.4041 0.016 3.2 0.5 ± 1.1
χ1 Ori 2008 Feb. 09 54 506.3765 0.601 3.7 4.8 ± 1.2
χ1 Ori 2008 Feb. 10 54 507.3208 0.787 2.9 1.0 ± 1.0
χ1 Ori 2008 Feb. 11 54 508.3805 0.996 3.0 2.7 ± 1.0
χ1 Ori 2008 Feb. 12 54 509.3842 0.193 3.4 2.3 ± 1.1
χ1 Ori 2008 Feb. 13 54 510.3801 0.389 3.6 5.8 ± 1.2
χ1 Ori 2008 Feb. 14 54 511.3971 0.590 3.3 4.8 ± 1.1
χ1 Ori 2008 Feb. 15 54 512.3791 0.783 3.3 0.9 ± 1.1

χ1 Ori 2010 Sep. 19 55 459.6636 0.256 2.8 1.0 ± 0.9
χ1 Ori 2010 Sep. 26 55 466.6600 0.633 3.7 1.3 ± 1.2
χ1 Ori 2010 Sep. 27 55 467.6954 0.837 3.0 1.1 ± 1.0
χ1 Ori 2010 Sep. 28 55 468.7158 0.038 3.4 0.6 ± 1.1
χ1 Ori 2010 Oct. 04 55 474.5821 0.193 4.3 6.9 ± 1.4
χ1 Ori 2010 Oct. 13 55 483.6796 0.984 2.7 2.5 ± 0.9
χ1 Ori 2010 Oct. 20 55 490.7126 0.368 5.8 3.0 ± 1.9

χ1 Ori 2011 Oct. 11 55 846.6525 0.435 6.1 4.3 ± 2.0
χ1 Ori 2011 Oct. 13 55 848.6628 0.831 2.9 3.3 ± 1.0
χ1 Ori 2011 Oct. 14 55 849.7083 0.037 2.9 1.0 ± 1.0
χ1 Ori 2011 Oct. 25 55 860.6708 0.195 3.4 5.0 ± 1.1
χ1 Ori 2011 Nov. 08 55 874.5771 0.932 3.7 2.7 ± 1.3
χ1 Ori 2011 Nov. 16 55 882.5564 0.503 3.5 4.1 ± 1.2
χ1 Ori 2011 Nov. 21 55 887.5239 0.481 10.5 2.4 ± 3.5
χ1 Ori 2011 Nov. 23 55 889.6361 0.896 4.0 2.2 ± 1.3
χ1 Ori 2011 Nov. 26 55 892.6407 0.488 4.4 6.4 ± 1.5
χ1 Ori 2011 Nov. 27 55 893.6552 0.688 3.5 3.4 ± 1.2
χ1 Ori 2011 Nov. 28 55 894.6328 0.880 3.1 4.7 ± 1.0
χ1 Ori 2011 Nov. 29 55 895.5903 0.069 3.3 1.6 ± 1.1

BE Cet 2013 Sep. 09 56 545.5796 0.000 5.1 0.5 ± 1.4
BE Cet 2013 Sep. 09 56 545.6296 0.007 5.2 0.4 ± 1.5
BE Cet 2013 Sep. 09 56 545.7436 0.021 3.9 2.4 ± 1.1
BE Cet 2013 Sep. 10 56 546.6225 0.136 4.1 1.8 ± 1.1
BE Cet 2013 Sep. 10 56 546.7318 0.151 5.0 1.6 ± 1.4
BE Cet 2013 Sep. 11 56 547.5761 0.261 5.9 1.5 ± 1.7
BE Cet 2013 Sep. 11 56 547.6220 0.267 5.1 0.4 ± 1.4
BE Cet 2013 Sep. 11 56 547.7310 0.281 6.4 1.3 ± 1.8
BE Cet 2013 Sep. 12 56 548.6238 0.398 3.4 9.4 ± 1.0
BE Cet 2013 Sep. 12 56 548.7314 0.412 3.3 8.9 ± 0.9
BE Cet 2013 Sep. 14 56 550.6174 0.659 7.1 6.4 ± 2.0
BE Cet 2013 Sep. 15 56 551.7612 0.808 6.7 4.0 ± 1.9

κ1 Cet 2012 Oct. 01 56 202.5218 0.000 5.5 8.2 ± 0.9
κ1 Cet 2012 Oct. 02 56 203.5191 0.108 4.4 4.7 ± 0.7
κ1 Cet 2012 Oct. 03 56 204.5265 0.218 7.9 2.5 ± 1.3
κ1 Cet 2012 Oct. 04 56 205.5385 0.328 4.8 3.1 ± 0.8
κ1 Cet 2012 Oct. 05 56 206.5252 0.435 5.6 3.4 ± 1.0
κ1 Cet 2012 Oct. 12 56 213.5563 0.199 8.0 4.7 ± 1.4
κ1 Cet 2012 Oct. 13 56 214.4813 0.300 5.2 2.6 ± 0.9
κ1 Cet 2012 Oct. 23 56 224.5461 0.394 7.2 4.9 ± 1.2
κ1 Cet 2012 Oct. 28 56 229.5581 0.939 5.6 1.3 ± 1.0
κ1 Cet 2012 Oct. 31 56 232.5049 0.259 5.8 5.3 ± 1.0
κ1 Cet 2012 Nov. 06 56 238.5733 0.919 4.8 1.9 ± 0.8
κ1 Cet 2012 Nov. 12 56 244.4962 0.562 6.7 0.9 ± 1.2
κ1 Cet 2012 Nov. 14 56 246.5362 0.784 4.9 3.3 ± 0.8
κ1 Cet 2012 Nov. 22 56 254.4716 0.647 7.6 0.3 ± 1.3

κ1 Cet 2013 Sep. 09 56 545.7018 0.302 4.9 1.2 ± 0.8
κ1 Cet 2013 Sep. 09 56 545.9281 0.327 5.1 0.9 ± 0.9
κ1 Cet 2013 Sep. 10 56 546.7004 0.411 11.0 0.1 ± 1.9
κ1 Cet 2013 Sep. 10 56 546.9248 0.435 3.5 1.0 ± 0.6
κ1 Cet 2013 Sep. 11 56 547.7017 0.520 6.4 3.2 ± 1.1
κ1 Cet 2013 Sep. 11 56 547.9248 0.544 5.9 1.9 ± 1.0
κ1 Cet 2013 Sep. 12 56 548.7013 0.628 4.7 4.0 ± 0.8
κ1 Cet 2013 Sep. 12 56 548.9226 0.652 5.9 4.0 ± 1.0
κ1 Cet 2013 Sep. 15 56 551.7258 0.957 9.7 4.7 ± 1.7
κ1 Cet 2013 Sep. 15 56 551.8868 0.974 6.8 4.4 ± 1.2
κ1 Cet 2013 Sep. 15 56 551.8980 0.976 8.6 6.4 ± 1.5

Notes. The name of the star is found in the first column, the date of the observation in the second column, the heliocentric Julian date in the third column, the rotational phase in the fourth column, the associated mean uncertainty per velocity bin of the LSD profiles in the fifth column and the mean longitudinal magnetic field strength in the sixth column.

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