Robustness of f ₉₅(L _wh,thr) at T = 300 K to methodological choices. We compare STRICT vs. LENIENT (W4 relaxed) artifact policies and different masking strategies (none, Stern only, Stern+Assef, and the full Stern+Assef+Jarrett union). Curves are nearly indistinguishable across the threshold range, demonstrating that our main conclusions are insensitive to reasonable variations in artifact cuts and AGN/starburst masks.