Principal components four to six. White means stronger correlation and black means anticorrelation. The 3σ contour of the CH₂NH 4₁₃-3₁₂ transition is plotted in black. PC 4 shows anticorrelation between redshifted and blueshifted emission from vibrational transitions, indicating a more slowly rotating structure and a change in excitation of the molecular gas. PC 5 shows a double-lobed structure associated with line wings. PC 6 shows a correlation with the low velocity components of the ground state HCN line and a weak anti-correlation with the line wings. The vertical lines mark the redshifted rest frequencies of the same lines identified in Fig. 5.