Dust scale height at R = 100 au, H₁₀₀, as a function of bolometric temperature T_bol for protostellar and PPDs spanning Class 0, Class I, and Class II evolutionary stages. Filled symbols represent sources modeled in this work, while open symbols denote values compiled from the literature; details of their derivation are provided in the text. Downward-pointing triangles denote upper limits. The dashed vertical lines mark the adopted boundaries between evolutionary classes based on T_bol. The downward arrow associated with HL Tau, shown as the open square near the second vertical dashed line, indicates that its H₁₀₀ value is an upper limit. The overall decrease in H₁₀₀ as T_bol increases suggests progressive dust settling and disk flattening with evolutionary age.