WD 0004+122: V∕I spectrum of WD 0004+122 (red) superposed twice on diagram showing wavelengths of Hα components as a function of field strength. Spectra are placed at approximate levels where 7330 Å polarisation feature coincides with strongest red σ transition 2p-1–3d-2 (heavy blue curve), showing possible interpretation of feature as produced by either ⟨|B|⟩ ≈60 or ⟨|B|⟩≈ 200 MG field.).