12CO v = 1−0 R02 emission and v = 0–1 absorption in HD 97048 (upper left panel). 12CO v = 0–2 R02 absorption in R CrA (upper right panel), the line center velocity of the 12CO v = 1−0 emission lines is shown by the red dashed line. The Boltzmann plot (lower left panel) and line widths (lower right panel) for the 12CO v = 0–2 and 13CO v 0–1 ro-vibrational absorption lines in the spectrum of R CrA (notation similar to Fig. 3). The vertical green line in the bottom right panel at 3.18 km s-1 shows the spectral resolution of our observations.
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