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Fig. A.1

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Three mean spectral lines of 12CO (3–2), 13CO (3–2), and Hα RRL are observed in filament G37. The 12CO (3–2) spectrum is represented by the blue line, while the 13CO (3–2) spectrum is depicted by the orange line. Additionally, the Hα RRL spectrum, with its intensity multiplied by 20 times, is shown by the red line.
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