Table 4: Model parameters derived to fit the inner knots NK 1 and SK 1 with a J-type shock. $n = n({\rm H}) + 2n({\rm H_2})$ is taken as the hydrogen nucleon density.
Parameter NK 1/SK 1

        Size, L $_{\rm bow}$ 3.9 $\times$ 10¹⁵ cm

(1) H density,    n 9.0 $\times$ 10⁴ cm^-3

(2) Molecular fraction    f $^{\ast}$ 0.2

(3) Alfvén speed,    $v_{\rm A}$ 8 km s^-1

        Magnetic field 1.3 mG

(4) Bow velocity,    $v_{\rm bow}$ 36 km s^-1

(5) Angle to l.o.s. 90 $^{\circ}$

(6) Shape parameter   s 1.5

(7) Field angle,    $\mu$ -54 $^{\circ}$

$\ast$ The molecular fraction is given by $f=n({\rm H_2})/n$
so when f=0.5 the gas is fully molecular.

**Table 4:** Model parameters derived to fit the inner knots NK 1 and SK 1 with a J-type shock. $n = n({\rm H}) + 2n({\rm H_2})$ is taken as the hydrogen nucleon density.
Parameter	NK 1/SK 1
Size, L $_{\rm bow}$	3.9 $\times$ 10¹⁵ cm
(1) H density, n	9.0 $\times$ 10⁴ cm^-3
(2) Molecular fraction f $^{\ast}$	0.2
(3) Alfvén speed, $v_{\rm A}$	8 km s^-1
Magnetic field	1.3 mG
(4) Bow velocity, $v_{\rm bow}$	36 km s^-1
(5) Angle to l.o.s.	90 $^{\circ}$
(6) Shape parameter s	1.5
(7) Field angle, $\mu$	-54 $^{\circ}$

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