High‐state (epoch 2, solid line) and low‐state (epoch 5, dotted line) continuum‐subtracted Mg II + Fe II emission line complex and their difference (dashed line). For clarity, each spectrum has been binned into 2 Å wide bins. The derived errors (Poissonian) in the difference spectrum, displaced for clarity, are indicated by the vertical bars. We detect no significant variation in the broad Mg II and UV Fe II emission‐line complex. The absorption lines are Galactic in origin.