Line profiles of identified species from each continuum peak. In measuring the main V_peak and ΔV of each line at each substructure, lines in green and notes in blue (in the form of “value(error)”) are given by the Gaussian fittings using Gildas software. Multi-Gaussian fittings are used to CH₃CN, , HCOOCH_{3 (ν = 0)}, and CH₃COCH₃ due to blending, and to SO₂, ³⁴SO₂, and SO due to the second velocity component (the second velocity component of HNCO measured from multi-Gaussian fittings are given in Fig. 7). Single Gaussian fittings are used to the rest lines, while lines whose V_peak cannot be measured by Gaussian fittings owing to strong self-absorption are marked with “**”, and non-detections are not marked. Two red vertical lines in each panel mark the velocity range over which the emission from each species is integrated to make the distribution maps shown in Figs. 4 and 5.