12CO J = 1 − 0, 13CO J = 1−0, and C18O J = 1−0 spectra at the peak position of the molecular cores A, B, C, and D. To better show the profile of C18O J = 1 − 0 line, only the C18O J = 1−0 intensity is amplified to 1.5 times of the original intensity. The red lines represent the Gaussian fitted lines.
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