Bending angle in degrees as a function of the stellar mass, M_⋆ (top), of the X-ray galaxy group mass, M₂₀₀ (middle), and of the X-ray galaxy group temperature, kT, in kilo-electronvolts (bottom). In all panels, red pentagons denote COSMOS objects and filled blue stars denote XMM-LSS objects. In the COSMOS sample, BGGs are shown as filled symbols. For the XMM-LSS sample, the BGG information is not available at the time of writing due to the different methods the X-ray groups were defined (see Sect. 2.5). The dashed line at 180° indicates a straight source.