⟨ B_z ⟩ and ⟨ B ⟩ variations of HD 94660. The solid black lines are the adopted magnetic field model variations from Sect. 4.3. Top: ⟨ B_z ⟩ LSD measurements using the full mask (black circles) and Nd mask (green triangles). Note that the open and filled symbols denote measurements from the ESPaDOnS spectrum and HARPSpol spectra, respectively. Balmer line measurements from Landstreet et al. (2014) are the filled red squares. Bottom: phased ⟨ B ⟩ measurements from Fe ii 6149 (blue squares), Cr ii 6833 (red triangles) and Nd iii 6145 (green circles). The dotted green line is the best-fit sinusoidal variations to the Nd measurements.