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Table 2

Results from the multicomponent HC3N LTE fitting procedure and from the rotational diagram (rd).

Component FWHM (km s–1) vLSR (km s–1) Tex (K) N (×1014 cm–2) Tex(rd)(K)$\matrix{ {T_{{\rm{ex}}}^{({\rm{rd}})}} \hfill \cr {({\rm{K}})} \hfill \cr } $ N(rd) (×1014 cm–2) θsource(a) (″/pc)
Low- J transitions (Eup < 100 K)

C1 – broad 23.62 ± 0.17 67.79 ± 0.09 16.53 ± 0.15 6.54 ± 0.07(b) 16.9 ± 0.2 7.8 ± 0.3 >27/>1(c)
C2 – narrow 7.2 ± 0.6 73.5 (c) 14.5 ± 1.7 9 ± 3(b) 15.9 ± 0.4 2.5 ± 0.2 9/0.36 (c)
C3 – narrow 8.8 (c) 77(c) 64 (c) 0.29 ± 0.18 86 ± 12 0.12 ± 0.02 7.6/0.3 (c)

High- J transitions (Eup > 100 K)

C1 – broad 22.8 ± 0.4 67.2 ± 0.3 31.5 ± 0.8 0.93 ± 0.08 29 ± 2 1.2 ± 0.4 >27/>1(c)
C2 – narrow 7.2 (c) 73.5 (c) 14.5 (c) 7.1 ± 1.7 14.1 ± 0.7 5.6 ± 2.5 9/0.36 (c)
C3 – narrow 8.8 ± 0.5 77 (c) 64 ± 10 0.36 ± 0.07(b) 63 ± 21 0.29 ± 0.19 7.6/0.3 (c)

Notes.(rd) Results from the rotational diagram. (a)The source size corresponds to the diameter. (b)Used as input for the non-LTE analysis explained in Sect. 3.3. (c)Parameters without errors are fixed in the fitting procedure, as explained in Sect. 3.1.

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