Top panel: sky-projected orbital obliquity of known exoplanets as a function of their scaled orbital distance a/R_* from the host star. The plot includes all planets with M_p < 13 M_Jup and a/R_* < 25. They are represented by circles, whose sizes are proportional to their mass. The planets surrounded by the green circles are those examined in this work, except for HAT-P-26 b. Bottom panel: true orbital obliquity of known exoplanets. They are represented by circles, whose size are proportional to their radius. The planet surrounded by the green circle is HAT-P-21 b., which was examined in this work. Both panels: the error bars have been suppressed for clarity. Colour indicates the effective temperature of their parent stars. The data were taken from TEPCat in February 2022. Figure inspired by similar plots from J. Winn; see also Zhou et al. (2019).