Variation of ⟨ B_z ⟩ for HD 94660 with MJD as measured using Balmer lines (blue error bars with circles), and metallic spectrum (green error bars with x’s), for data obtained using the 600 B and 1200 B grisms. The solid smooth curve is best sine wave fit to ⟨ B_z ⟩ measured using Balmer lines, assuming P = 2800 d. The dashed straight red line is the approximately constant field reported by Bohlender et al. (1993); the dashed orange curve is the sine wave fit to CASPEC ⟨ B_z ⟩ measurements described by Landstreet & Mathys (2000).