Fraction of light in IGL compared to the total group light (f_IGL) of the KiDS+GAMA groups at different redshifts from the 0^th order (p₀) background-subtracted images. The x-axis indicates the mean halo mass M_h of the corresponding bin. Pink, yellow, and cyan shaded regions show the upper and lower limit of f_IGL for the redshift ranges 0.09 < z < 0.15, 0.16 < z < 0.21, and 0.21 < z < 0.27, respectively. Blue and purple lines show prediction of f_IGL from the Hydrangea simulations at comparable redshifts (mentioned in labels). The range of f_IGL is comparable between simulations and observations.