Table 1: Observations of EK Eri (for details, see Sect. 2.1).
Date Rot. Exp. S/N Ca  II K Ca  II K Ca  II H$\alpha $ $B_{\rm l}$ $\sigma$ $V_{\rm rad}$
  Phase s   V comp. R comp. 854.2   G G km s-1
20 Sep. 07 0.00 3600 816 0.55 0.53 0.319 0.226 -98.6 1.0 7.118
12 Nov. 07 0.17 2280 900 0.49 0.46 0.291 0.233 -21.1 0.7 7.047
13 Nov. 07 0.17 2280 731 0.50 0.47 0.297 0.233 -21.4 0.9 7.053
19 Jan. 08 0.39 2400 545 0.47 0.43 0.303 0.230 -28.9 1.2 7.096
20 Jan. 08 0.39 2400 720 0.47 0.43 0.295 0.227 -31.6 0.9 7.110
06 Feb. 08 0.45 2400 779 0.47 0.44 0.302 0.234 -45.6 0.8 7.111
03 Apr. 08 0.63 1200 675 0.50 0.48 0.339 0.250 -62.7 1.2 7.145
Notes: Dates, rotational phases, exposure times, maximum S/N in Stokes I, I/I(395) values for Ca  II K, $R_{\rm c}$ values for Ca  II 854.2 and H$\alpha $, $B_{\rm l}$ values and their uncertainties in G for the magnetic field and radial velocity.

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