This diagram shows how basic system parameters affect fits to the observed data. The center-of-mass velocity, V_gam, controls the radial velocity offset of the line profiles. The K₁ and K₂ velocities determine the maximum relative separation of the line profile contributions from both components. The radii of both components, r₁ and r₂, with the line EW determine the fit to the width and strength of the line profiles, while the mass ratio, q, determines the overall width depending on the K₁ and K₂ velocities. The surface temperatures of both components, T₁ and T₂, with the line EW parameter control the the strength of the line profiles.