Table 1: Telescope settings and parameters.
Line Frequency HPBW $F_{\rm throw}$ $T_{\rm SYS}$ $\Delta v_{\rm res}$
  GHz $^{\prime \prime }$ kHz K km s-1
${\rm N}_2{\rm H}^+$ (1-0) 93.1737725 26 7.5 150 0.063
${\rm N}_2{\rm H}^+$ (3-2) 279.511385 9 14.3 1900 0.021
${\rm N}_2{\rm D}^+$ (2-1) 154.217137 16 7.5 370 0.038
${\rm N}_2{\rm D}^+$ (3-2) 231.321966 10 14.3 750 0.050
${\rm C}^{18}{\rm O}$(1-0) 109.782160 22 ... 170 0.026
${\rm C}^{18}{\rm O}$(2-1) 219.560319 11 ... 450 0.033
${\rm C}^{17}{\rm O}$(1-0) 112.358988 21 7.5 230 0.026
${\rm C}^{17}{\rm O}$(2-1) 224.714368 11 14.3 730 0.052
Column 2 line rest freq.; Col. 3 Half Power Beam Width;
Col. 4 Freq. Throw; Col. 5 Syst. Temperature (K);
Col. 6 Channel Spacing.

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