Mean magnetic field modulus (top) and mean quadratic magnetic field (bottom) of HD 110274 against rotation phase computed with the value $P_{\mathrm{rot}}=265\stackrel{\text{d}}{.}3$ of the rotation period derived by Freyhammer et al. (2008). The phase origin has been set at JD 2 454 140.0. The dash-dotted blue curve represents the least-squares fit of the measurements by a sine curve. Different point types and colours are used to distinguish the observations performed with different instruments. The size of the error bars for the ⟨B⟩ values does not exceed that of the symbols representing them.