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Table B.1

Column densities and ratios, in ranges of 1 km s-1, of the selected positions (see Fig. 2).

Velocity range (km s-1) 56 67 78 89 910 1011 1112 1213 1314 Total*

For the CO+ line ~3σ >3σ ~3σ

IF position — offset [0″, 0″]

N[CO+] (in 1011 cm-2) 0.14 0.50 1.34 1.34 1.20 1.90 1.60 0.82 0.57 9.75a
N[HCO+] (in 1013 cm-2) <0.04 0.06 0.15 0.34 1.44 2.42 1.92 0.70 0.05 6.79a
N[C+] (in 1017 cm-2) 0.63 4.00 5.10 6.00 5.60 4.70 3.30 1.24 1.67 48.00b
N[CO+]/N[HCO+] >0.04 0.08 0.09 0.04 0.08 0.08 0.01 0.01 0.11 0.02
X[CO+] (in 10-11) 2.22 1.47 2.16 2.23 2.14 4.04 4.90 6.61 3.41 2.03

MP2 position — offset [0″, 40″]

N[CO+] (in 1011 cm-2) <1.71 <1.71 <1.71 <1.71 <1.71 <1.71 <1.71 <1.71 <1.71 <4.5d
N[HCO+] (in 1013 cm-2) <0.04 0.06 0.29 2.21 1.46 0.71 0.29 0.06 0.06 5.84a
N[C+] (in 1017 cm-2) 0.63 0.97 1.31 1.52 1.38 0.78 0.34 0.29 0.33 10.15c
N[CO+]/N[HCO+] >0.043 <0.285 <0.058 <0.007 <0.011 <0.024 <0.058 <0.29 <0.285 <0.008
X[CO+] (in 10-10) <2.71 <1.76 <1.31 <1.13 <1.24 <2.19 <5.03 <5.89 <5.18 <0.45

PDR3 position — offset [−10″, 24″]

N[CO+] (in 1011 cm-2) <1.35 0.58 1.19 1.77 2.45 2.68 1.66 0.72 <1.35 13.02a
N[HCO+] (in 1013 cm-2) <3.34 <3.34 <3.34 1.70 5.17 6.10 3.04 <3.34 <3.34 20.22a
N[C+] (in 1017 cm-2) 0.99 1.37 1.68 2.26 2.70 1.93 0.95 1.00 1.14 18.04c
N[CO+]/N[HCO+] >0.004 >0.002 >0.004 0.010 0.005 0.004 0.005 >0.002 >0.004 0.006
X[CO+] (in 10-10) 1.36 0.42 0.71 0.78 0.91 1.92 1.75 0.72 1.18 0.72

Notes. We assumed LTE and Tex = 18 K to calculate N[CO+], while N[HCO+] and N[C+] were calculated assuming LVG. For the IF position, we assume Tk = 600 K, nH = 4 × 105 cm-3. For MP2 position, we assume Tk = 300 K and nH = 2 × 105 cm-3. For PDR3 position, we assume Tk = 300 K and nH = 4 × 104 cm-3.

(*)

Total velocity range of each line.

(a)

In a velocity range of 514 km s-1.

(b)

In a velocity range of 425 km s-1.

(c)

In a velocity range of 030 km s-1.

(d)

considering the rms in a velocity range of 7 km s-1.

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