Table 4
Derived average values for both parts of the ridge.
| Region |  13CO |
 NH3 |
 N2 H+ |
nc (a) |  |
λJ | λcyl | MJ | Mcyl |  |
 |
 |
 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (km s−1) | (km s−1) | (km s−1) | (104 cm−3) | (104 cm−3) | (pc) | (pc) | (M⊙) | (M⊙) | (pc) | (pc) | (M⊙) | (M⊙) | |
| Active | 2.4 ± 0.4 | 1.5 ± 0.2 | 1.5 ± 0.4 | 17 ± 4 | 2.0 ± 0.9 | 0.18 ± 0.04 | 0.21 ± 0.02 | 4 ± 1 | 450 ± 90 | 1.10 ± 0.31 | 1.33 ± 0.27 | 971 ± 531 | 2803 ± 739 |
| Quiescent | 1.8 ± 0.2 | 1.3 ± 0.2 | 0.6 ± 0.5 | 7 ± 2 | 1.0 ± 0.4 | 0.21 ± 0.05 | 0.29 ± 0.02 | 4 ± 1 | 302 ± 55 | 1.38 ± 0.36 | 1.83 ± 0.30 | 925 ± 462 | 1888 ± 443 |
Notes. Except for 13CO-based measurements, the averages tabulated use the straightened values over the same width and length as in Fig. 4, whereas 13CO-based values are averaged over a 2.82 pc scale (i.e. 1.41 pc either side of the ridge). All mean values use 1-sigma errors. The remaining errors are calculated using error propagation unless otherwise stated. (a) Uncertainty estimated from 1-sigma confidence in χ2 residuals in Appendix B. 
is the mean effective dispersion for the transitions listed, nc is the central number density and 
is the mean number density. λ and M refers to fragmentation length and mass, where the subscript J refers to Jeans values and cyl refers to cylindrical fragmentation values. Any superscripts with eff show that the fragmentation scale was calculated using
rather than the thermal dispersion.
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