Sky-projected orbital obliquity of known exoplanets as a function of their orbital eccentricity. Different colours indicate a different value of T_eff: dark red are for cool hosts (T_eff < 6250 K); orange are for hot hosts 6250 < T_eff < 7000 K; yellow are for very hot hosts T_eff < 7000 K. A number of these planets exhibiting an eccentricity equal to zero does not have horizontal error bars. The planets surrounded by the green circles are those examined in this work, except for HAT-P-26 b. The other data were taken from TEPCat in February 2022.