Principal components two and three. White means stronger correlation, and black means anticorrelation. The 3σ contour of the CH₂NH 4₁₃-3₁₂ transition is plotted in black. PC 2 shows evidence for an “envelope” around the millimeter continuum, and PC 3 shows anticorrelated redshifted and blueshifted emission indicative of rotation. The vertical lines mark the redshifted rest frequencies of the same lines identified in Fig. 5.