KX Vel photometry by Balona & Laing (1986). The open circle at the right represents the level of the measurements out of minimum. The black curve corresponds to the solution with i = 74.6°; the gray curve to the solution with i = 60°. The vertical line is drawn at the phase of the conjunction according to the FOTEL solution of the spectroscopy. The phase is calculated from the time of periastron.