Table 4: Results of velocity gradient fits.
Line ${\cal G}$ $\Theta ^{a}$ $\langle{\cal G}_{\rm l}\rangle ^{b}$

(km s^-1 pc^-1) (deg) (km s^-1 pc^-1)

${\rm N}_2{\rm H}^+$ (1-0) 0.366 $\pm$ 0.005 -133.6 $\pm$ 0.7 1.9 $\pm$ 0.1

${\rm N}_2{\rm H}^+$ (3-2) 1.1 $\pm$ 0.1 -168 $\pm$ 9 2.7 $\pm$ 0.3

${\rm N}_2{\rm D}^+$ (2-1) 0.95 $\pm$ 0.06 +145 $\pm$ 5 3.5 $\pm$ 0.2

${\rm N}_2{\rm D}^+$ (3-2) 0.4 $\pm$ 0.2 -128 $\pm$ 27 4.7 $\pm$ 0.4

NOTE: ^a Direction of increasing velocity, measured East of North.
^b Mean values of the magnitude of local velocity gradients and corresponding standard error.

**Table 4:** Results of velocity gradient fits.
Line	${\cal G}$	$\Theta ^{a}$	$\langle{\cal G}_{\rm l}\rangle ^{b}$
	(km s^-1 pc^-1)	(deg)	(km s^-1 pc^-1)
${\rm N}_2{\rm H}^+$ (1-0)	0.366 $\pm$ 0.005	-133.6 $\pm$ 0.7	1.9 $\pm$ 0.1
${\rm N}_2{\rm H}^+$ (3-2)	1.1 $\pm$ 0.1	-168 $\pm$ 9	2.7 $\pm$ 0.3
${\rm N}_2{\rm D}^+$ (2-1)	0.95 $\pm$ 0.06	+145 $\pm$ 5	3.5 $\pm$ 0.2
${\rm N}_2{\rm D}^+$ (3-2)	0.4 $\pm$ 0.2	-128 $\pm$ 27	4.7 $\pm$ 0.4

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