Table 4: N₂H⁺(1-0) line parameters with optical depths.
Source ( $\Delta \alpha \hbox{$^{\prime\prime}$ }$ , $\Delta \delta \hbox{$^{\prime\prime}$ }$ ) $T_{\rm EX}$ (12-12) $T_{\rm EX}$ (23-12) $T_{\rm EX}$ (01-12) $V_{\rm LSR}$ (23-12) $\Delta V$ $\tau$ (23-12)

(K) (K) (K) (km s^-1) (km s^-1)

RNO 1B (0,0)
7.75(0.37) 9.18(0.38) 7.32(0.50) -17.54(0.01) 1.94(0.06) 1.0(0.1)

S 255 (0,60) 9.3(1.6) 10.6(1.6) 10.1(2.2) 8.96(0.02) 2.31(0.10) 0.5(0.2)

S 76E (-20,-20) 24.4(4.2) 27.0(4.3) 27.1(5.4) 32.44(0.01) 2.86(0.06) 0.3(0.1)

DR 21 (0,-40) 20.3(1.3) 22.8(1.3) 25.0(2.1) -3.25(0.01) 3.09(0.04) 0.6(0.1)

S 140 (60,20) 21.4(3.7) 25.4(4.1) 27.0(5.5) -7.03(0.01) 1.62(0.05) 0.4(0.1)

G 270.26+0.83 (-20,20) 8.8(1.5) 9.2(1.5) 8.8(1.8) 9.69(0.02) 3.17(0.08) 0.3(0.1)

G 291.27-0.71 (-80,-100) 24.2(6.0) 25.9(6.2) 29.1(7.7) -24.36(0.01) 2.90(0.03) 0.15(0.05)

G 316.77-0.02 (240,-60) 8.9(0.6) 10.1(0.6) 10.1(0.9) -37.94(0.01) 3.61(0.06) 0.5(0.1)

G 345.01+1.80 (-20,20) 11.8(0.3) 14.3(0.3) 13.4(0.5) -14.07(0.01) 3.08(0.02) 0.62(0.03)

G 351.41+0.64 (20,100) 16.3(0.3) 18.2(0.2) 20.6(0.5) -4.20(0.01) 3.65(0.02) 0.86(0.03)

**Table 4:** N₂H⁺(1-0) line parameters with optical depths.
Source ( $\Delta \alpha \hbox{$^{\prime\prime}$ }$ , $\Delta \delta \hbox{$^{\prime\prime}$ }$ )	$T_{\rm EX}$ (12-12)	$T_{\rm EX}$ (23-12)	$T_{\rm EX}$ (01-12)	$V_{\rm LSR}$ (23-12)	$\Delta V$	$\tau$ (23-12)
	(K)	(K)	(K)	(km s^-1)	(km s^-1)
RNO 1B (0,0)	7.75(0.37)	9.18(0.38)	7.32(0.50)	-17.54(0.01)	1.94(0.06)	1.0(0.1)
S 255 (0,60)	9.3(1.6)	10.6(1.6)	10.1(2.2)	8.96(0.02)	2.31(0.10)	0.5(0.2)
S 76E (-20,-20)	24.4(4.2)	27.0(4.3)	27.1(5.4)	32.44(0.01)	2.86(0.06)	0.3(0.1)
DR 21 (0,-40)	20.3(1.3)	22.8(1.3)	25.0(2.1)	-3.25(0.01)	3.09(0.04)	0.6(0.1)
S 140 (60,20)	21.4(3.7)	25.4(4.1)	27.0(5.5)	-7.03(0.01)	1.62(0.05)	0.4(0.1)
G 270.26+0.83 (-20,20)	8.8(1.5)	9.2(1.5)	8.8(1.8)	9.69(0.02)	3.17(0.08)	0.3(0.1)
G 291.27-0.71 (-80,-100)	24.2(6.0)	25.9(6.2)	29.1(7.7)	-24.36(0.01)	2.90(0.03)	0.15(0.05)
G 316.77-0.02 (240,-60)	8.9(0.6)	10.1(0.6)	10.1(0.9)	-37.94(0.01)	3.61(0.06)	0.5(0.1)
G 345.01+1.80 (-20,20)	11.8(0.3)	14.3(0.3)	13.4(0.5)	-14.07(0.01)	3.08(0.02)	0.62(0.03)
G 351.41+0.64 (20,100)	16.3(0.3)	18.2(0.2)	20.6(0.5)	-4.20(0.01)	3.65(0.02)	0.86(0.03)

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