Planet-to-star contrast ratio ϵ as a functionof the geometric albedo p and the planetary radius R_p. Solid contour lines indicate the contrast limit of 1.5 × 10⁻⁵ and the limits reached by Charbonneau et al. (1999), Leigh et al. (2003a) and Rodler et al. (2010) converted to 3σ confidence. The horizontal lines denote R = 0.8, 1.15 and 1.61 R_J, which are the minimum, the mean and the maximum radii of all known transiting hot Jupiters with masses between 3 and 9 M_J.