Notes. Each star is identified by its HD or BD number. N_m is the number of measurements of the mean magnetic field modulus from which its average ⟨ B ⟩ _av is computed. For stars for which the available ⟨ B ⟩ measurements do not adequately sample the rotation cycle, ⟨ B ⟩ _av and the ratio q between the highest and the lowest value of ⟨ B ⟩ appear in italics. N_z is the number of measurements from which the rms longitudinal field ⟨ B_z ⟩ _rms is computed, and r is the ratio of the extrema of ⟨ B_z ⟩ (defined in Sect. 5.2); the value of r is given only for those stars for which ⟨ B_z ⟩ measurements well distributed across the rotation phases are available. The references for the ⟨ B ⟩ (resp., ⟨ B_z ⟩) data are listed in Col. 4 (resp., Col. 8).

Reference. (1) Elkin et al. (2012); (2) Stütz et al. (2003); (3) Freyhammer et al. (2008); (4) Bagnulo et al. (2003); (5) Bagnulo et al. (2006); (6) Elkin et al. (2010c); (7) Hubrig & Nesvacil (2007); (8) Hubrig et al. (2006); (9) Elkin et al. (2011); (10) Elkin et al. (2010b); (11) Elkin et al. (2010a); (12) Kochukhov et al. (2013); (13) Hubrig et al. (2009a); (14) Bagnulo et al. (2015); (15) Kudryavtsev et al. (2006); (16) Ryabchikova et al. (2006); (17) Preston (1969a); (18) Borra & Landstreet (1978).