Absolute (R/r-band) peak magnitude versus the absolute value of the slope parameters of the (R/r-band) light curves (γ). The SNe Ibn from the F25 and Lit samples are presented as magenta and blue circles, respectively. The top-left, top-right, and bottom-right panels show the light curve slopes γ₋₁₀ (−10 to t_max), γ₊₁₀ (t_max to day +10), γ₊₂₀ (+10 to +20 days), and γ₊₃₀ (+20 to +30 days), respectively.