Orbital evolution of T (top panel) and the Hα centroid velocities (bottom panel). The curves have been folded using our spectroscopic orbital period 3.26 ± 0.02 h and a tentative T₀(HJD) = 2458313.41 ± 0.05 d, obtained by imposing that the deepest minima in the depth of the trough T are centred at phase 0.95. For the sake of clarity, one orbital cycle is repeated. The T curve shows a double-humped morphology with the orbital period.