Absolute value of λ, the sky-projected obliquity, as a function of planet mass M_p for the 37 planets with published RM measurements. Filled red markers denote systems with  |λ|  > 30°. The inset zooms on 0.3 M_Jup    < M_p < 1.9   M_Jup. The dotted lines mark aligned-prograde, polar, and aligned-retrograde systems (|λ|  = 0°,90°, and 180°, respectively). The 37 plotted planetary systems are the 21 ones compiled in Hébrard et al. (2010), plus XO-4 (Narita et al. 2010), WASP-1, 24, and 38 (Simpson et al. 2010), WASP-2, 4, 5, 15, and 18 (Triaud et al. 2010), WASP-8 (Queloz et al. 2010), WASP-19 (Hellier et al. 2011), HAT-P-4 and 14 (Winn et al. 2010a), HAT-P-8 (Simpson et al. 2010), HAT-P-11 (Winn et al. 2010b; Hirano 2010b), and HAT-P-6 (this work).