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Fig. A.2

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CO (2-1) line brightness temperature map. Indicated are the six pointings for which we performed the error beam correction analysis in Figure A.3. Pointings 1–4 are located in interarm regions (marked in orange). Pointings 5 and 6 are located in spiral arm regions (marked in purple). Contours are drawn at S/N = 10, 20,30. For the IRAM 30 m DDT project E02-20, we observed these six pointings (see Appendix B.1).

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