Comparison between profiles (along Declination) of opacity maps, extracted from original τ₈ µm map, and that predicted from τ₈₅₀ µm (denoted as µm) or τ₂₅₀ µm in the case of L1517B, and the scaled-up τ₈.µm map. The two versions of τ₈ µm map are both smoothed to 14″ (18″) to match the angular resolution of the τ₈₅₀ µm (τ₂₅₀ µm) map. The lower panel shows the ratios between scaled-up τ₈ µm and µm (). The grey shaded region indicates the effective radius of the final trimmed parameter maps of NH₃. Vertical dotted lines show the offset where the ratio drops below 0.5 (indicated by the horizontal dotted line).