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Table 1

Observed and derived quantities.

Velocity range (km s-1)
Quantity –196, –180 –164, –135 –41, –15 –15, –1 –1, 19

Rgal [pc] 320–1500 320–1500 1500–3035 3035–8500 3035–8500

WHI [K km s-1] 79.9(3.1) 32.8(3.8) 1062(6.1) 1524(7.6) 2622(10.4)
WHCO+ [km s-1] 0.802(0.025) 3.381(0.036) 1.108 (0.031) 9.10(0.03) 12.22(0.32)
WHCN [km s-1] 0.640(0.027) 1.310(0.036) 0.444(0.032) 8.62(0.03) 9.65(0.03)
WHNC [km s-1] 0.333(0.034) 0.062(0.031) 1.42(0.03) 1.72 (0.03)
WCO [K km s-1] 0 (0.44) 1.40(0.69) 5.55(0.50) 14.53(0.42) 22.37(0.49)

N(H I) [cm-2] 1.51(0.06) × 1020 6.13(0.71) × 1019 2.77(0.02) × 1021 4.05(0.02) × 1021 6.16(0.02) × 1021
N(HCO+) [cm-2] 8.58(0.26) × 1011 3.62(0.03) × 1012 1.18(0.03) × 1012 9.74(0.28) × 1012 1.31(0.03) × 1013
N(H2) [cm-2] 2.86 × 1020 1.21 × 1021 3.92 × 1020 3.25 × 1021 4.36 × 1021

XCO[cm-2/K-km s-1] >2.17 ×1020,a 8.64 × 1020 7.06 × 1019 2.24 × 1020 1.95 × 1020

Notes. See Sect. 2.3 for a description of table entries.

(a)

Using the 3σ upper limit for WCO.

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