Correlations of photosphere polarization degree (Π = |Q|/I), θ_c, Γ (or θ_jet), and E_iso. (a) Comparison of the photosphere polarization degree for smaller θ_c, Γ (Γ ⋅ θ_c, Γ = 1, solid lines; predicting a much larger polarization degree) and larger θ_c, Γ (Γ ⋅ θ_c, Γ = 2, dashed lines; predicting a much smaller polarization degree). (b) The smaller θ_jet (likely θ_c, Γ also) is found for the high-energy sample (E_iso ≳ 10⁵³ erg), indicating the polarization detection.