Orbital variability in RVs of individual Fe I absorption lines (the corresponding colours are given in the legend). The solid grey line represents the RV curve of the RG, , of Kenyon & Garcia (2016). Negative shifts of Fe I RV curves with respect to the curve indicate an outflow of matter from the donor star. The Fe I 6469 Å line shows the highest outflow velocities, with an average value of −3.8 km s⁻¹ (dotted line). At ϕ ≈ 0−0.2, low inflow velocities are indicated for a fraction of Fe I lines. The data points are duplicated at orbital phases 1.0−2.0 for a more continuous view of the variability.