Table 1: N₂H⁺(1-0) observing parameters.
Telescope $\Delta \Theta$ $\eta_{\rm mb}$ $T_{\rm sys}$ $\delta V$

( $\hbox{$^{\prime\prime}$ }$ ) (K) (km s^-1)

OSO-20 m 40 $\sim$ 0.5 250-500 0.8; 0.16

SEST-15 m 55 0.75 200-300 0.14

**Table 1:** N₂H⁺(1-0) observing parameters.
Telescope	$\Delta \Theta$	$\eta_{\rm mb}$	$T_{\rm sys}$	$\delta V$
	( $\hbox{$^{\prime\prime}$ }$ )		(K)	(km s^-1)
OSO-20 m	40	$\sim$ 0.5	250-500	0.8; 0.16
SEST-15 m	55	0.75	200-300	0.14

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