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Table 4:

Parameters of the hyperfine fits to the N2H+ (1-0) line.
    $A\tau_{\rm m}$b Velocityc Linewidthc   $T_{\rm ex}$ N(N2H+)
Object Linea (K km s-1) (km s-1) (km s-1) $\tau_{\rm m}$b (K) (cm-2)
MM1 1 $0.062\pm0.003$ -36.7 0.66 $0.20\pm0.02$ 3.1 $6.7\times10^{11}$
  2 $0.060\pm0.001$ -35.9 1.40 $\lesssim$0.1 3.4 $8.5\times10^{11}$
MM1-NE 1 $0.072\pm0.003$ $-36.7\pm0.1$ $0.68\pm0.02$ $0.15\pm0.02$ 3.3 $5.8\times10^{11}$
  2 $0.038\pm0.001$ $-35.6\pm0.1$ $0.98\pm0.04$ $\lesssim$0.1 3.2 $5.3\times10^{11}$
MM2   $0.031\pm0.001$ $-34.9\pm0.1$ $1.49\pm0.05$ $\lesssim$0.1 3.1 $7.6\times10^{11}$

Notes.  (a) For MM1 and the NE position of the MM1 ridge, the hyperfine structure is fitted with two velocity components. For MM2 the fit is made with one single velocity component. (b)  $A=f[J_\nu(T_{\rm ex})-J_\nu(T_{\rm bg})]$. $\tau_{\rm m}$is the optical depth of the main hyperfine, adopted to be the $F_1F=23\rightarrow12$line. The otpical depth of the isolated line can be obtained by multiplying $\tau_{\rm m}$ by the factor 3/7. (c) When errors are not given, the velocity and linewidth have been fixed from a fit of two Gaussian to the isolated line. When errors are given, the fit of two Gaussian to the isolated line was used to provide initial values for the velocity and linewidth of the hyperfine fit.


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