Left: ¹²CO ﹩J=1{\mbox{--}} 0﹩ spectrum integrated over the nebula (solid line) and parabolic fit to the ¹²CO profile (dashed line). The ¹²CO (center) and ¹³CO (right) intensity maps are integrated over the line profile, i.e., within the LSR velocity range ~[40:80] and [53:59] km s⁻¹, respectively. For ¹²CO (¹³CO) levels are −2, 2, ..., σ spaced every ﹩2\ \sigma =3.4﹩ Jy km s⁻¹ (−2, −1, 1, ..., σ spaced every ﹩1\ \sigma =0.6﹩ Jy km s⁻¹).