Radial velocity data and fit vs. the orbital phase. Solid symbols represent the primary and open symbols represent the secondary. V789 Mon (2RE J0725 − 002) on the left (squares data from Jeffries et al. 1995 and circles data from our observations) and GZ Leo (2RE J1101+223) on the right (squares data from Jeffries et al. 1995, triangles from Fekel & Henry 2000, rhombus from Strassmeier et al. 2000, circles from our McDonald98 observing run and stars from our FOCES02 observing run). The solid curves represent a minimum χ ² fit orbit solution as described in the text.