Two-dimensional t-SNE projections of the GRB prompt-emission parameter space. The left panel shows the embedding constructed from F_p, E_p, α, S_γ, and ﹩{\rm{\Delta }}{t}_{{\rm{\min }}}﹩, colored continuously by ﹩\mathrm{log}{T}_{90}﹩, illustrating the distribution of burst durations across the embedding. The middle panel shows the embedding constructed from F_p, E_p, α, and S_γ only, without including ﹩{\rm{\Delta }}{t}_{{\rm{\min }}}﹩, and also colored by ﹩\mathrm{log}{T}_{90}﹩. In this case, the GRB population shows a much less distinct structure, indicating that MVT provides important information for the duration-free classification. The right panel shows the same embedding as in the left panel, but colored by whether T₉₀ < 2 s (blue) or T₉₀ > 2 s (orange). Marker shapes indicate the two groups in the embedding: circles for Type 1 and diamonds for Type 2.