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Table 1:

Properties of background sources, and rms noise levels of the spectra.

Source
RA(J2000) Dec (J2000) l b Da $\sigma_l/T_{\rm c}$b $\sigma_l/T_{\rm c}$b $\sigma_l/T_{\rm c}$b $\sigma_l/T_{\rm c}$b $\sigma_l/T_{\rm c}$b
  (h) (m) (s) ($^{\circ}$) (') ('') ($^{\circ}$) ($^{\circ}$) (kpc) HCO+ (0-1) HCO+ (1-2) HNC (0-1) HCN (0-1) CN (0-1)
G05.88-0.39 18 00 30.4 -24 04 00 05.88 -0.39 3.8 0.021        
G08.67-0.36 18 06 18.9 -21 37 35 08.67 -0.36 4.8 0.138        
G10.62-0.38 18 10 28.7 -19 55 50 10.62 -0.38 4.8 0.049 0.206 0.043 0.035 0.064
G34.3+0.1 18 53 18.7 +01 14 58 34.26 +0.15 3.8 0.117 0.328 0.038 0.036 0.154
W49N 19 10 13.2 +09 06 12 43.17 +0.01 11.5 0.015 0.072 0.020 0.021 0.031
W51 19 23 43.9 +14 30 30.5 49.49 -0.39 7.0 0.022 0.089 0.043 0.034 0.070

Notes. (a) Source distance from Fish et al. (2003) who resolve the kinematic distance ambiguity. Errors are around 1.0 kpc. (b)  $\sigma_l/T_{\rm c}$is the rms noise divided by the continuum intensity of the spectra, at a frequency resolution of 40 kHz.


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