Radial velocity curves for J093010B, based on our WHT observations. The primary is shown with red squares and the secondary with blue diamonds; uncertainties are generally smaller than the symbol size. Phase-folding uses HJD 2 456 288.8780, found by PHOEBE modelling of radial velocity and light curves simultaneously, and our optimum period. The dashed line shows the location of the (modelled) system velocity.