Central position of the ¹³CO(J = 3–2) brightness distribution (marked with a white circle) on a Spitzer IRAC 3.6, 4.5, 5.8, or 8.0 µm image [for OH0.173+0.211 the position of the ¹²CO(J = 2–1) brightness distribution is used, and for OH359.149+0.043 the position of the 324 GHz continuum peak is used]. The size of the CO line brightness distribution is significantly smaller than the white circle in all cases.