Fig. 5

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Normalized intensity profiles of selected species towards L1489-IRS, B5-IRS1, L1455-IRS1, and L1551-IRS5. The profiles of SO, c-C3H2, H2CO (in all sources), CH3OH, CH3CHO, HCOOCH3 (in L1551-IRS5), and OCS (in L1455-IRS1) were obtained by stacking the detected transitions for each species in order to maximize the S/N. CH3OH (4−2,3 –3−1,2E) in B5-IRS1 and L1455-IRS1 is the transition at 218 440 MHz; H2CS (71,7 –61,6) in B5-IRS1, L1455-IRS1, and L1551-IRS5 is the transition at 236 727 MHz; H2S (22,0 –21,1) in L1455-IRS1 and L1551-IRS5 is the transition at 216 710 MHz; OCS (19–18) in L1551-IRS5 is the transition in 231 060 MHz.
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