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Fig. 8

image

Line stacking of the H2CO (left) and the NaCl (right) lines detected, with a spectral resolution of 2 MHz. Black spectrum correspond to the H2CO Ka = 0 lines and the NaCl lines with Eu = [22.5–56.9] K, pink spectrum correspond to the H2CO Ka = 1 lines and the NaCl lines with Eu = [85.0–118.7] K, and blue spectrum correspond to the H2CO Ka = 2 lines and the NaCl lines with Eu = [131.2–187.4] K.

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