Radius of the Roche lobe, RL, of the RG (solid line) and the semimajor axis, a, of the Draco C1 orbit (dashed line) versus the mass ratio, q (lower x-axis), and inclination, i (upper x-axis). The radius of the photosphere of the Draco C1 RG RRG and minimum mass ratio q = 0.344 are indicated by the blue star. Note that RL depends very weakly on q (and therefore i), so that for any inclination the orbital separation is expected to be large enough that the RG’s photosphere is inside the Roche lobe.