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Fig. 6

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Some observed transitions of DME and DME-1D (black) and the computed LTE model (red) using the CASSIS software. E values are the upper energy level of the observed lines. The notation E refers to the notation used in Table 1. The LTE model has been computed in bins of the same spectral resolution as the observations. Other transitions from other species are also present in these spectra. Panels a) to d): some observed transitions of DME. Panels e) to h): all detected transitions of DME-1D-sym. Panel e) DME-1D-sym (91,9 − 80,8) E and A lines. The blended lines are 1: OCS (14 − 13) and 2: CHOH (10 − 9). Panel f) DME-1D-sym (121,12 − 110,11) E and A lines. The blended lines are 3: HCOOCH (17 − 16) and 4, 5, 6: CHCHO (11 − 10) transitions. Panel g) DME-1D-sym (131,13 − 121,12) E and A lines. Panel h) DME-1D-sym (82,7 − 71,6) E and A lines. The blended lines are 7: HCOOCH (18 − 17), 8: HCO (31,2 − 21,1) and one unidentified line (9: around 13 km s). Panels i) to n): All detected transitions of DME-1D-asym. Panel i) DME-1D-asym (51,5 − 40.4) E and A lines. Panel j) DME-1D-asym (70,7 − 61,6) E and A lines. Panel k) DME-1D-asym (90,9 − 81,8) E and A lines. The blended line is 10: HC(O)NH (74,4 − 64,3). Panel l) DME-1D-asym (100,10 − 91,9) E and A lines. Panel m) DME-1D-asym (91,9 − 80,8) E and A lines. Panel n) DME-1D-asym (121,12 − 110,11) E and A lines.

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