**Table 1:** Line parameters.
Transition	$\int T_{\rm A}^{*}{\rm d}v$	$v_{\rm LSR}$	$v_{\rm exp}$	$\frac{\rm C}{\rm H}$ ^a
	mK km s^-1	km s^-1	km s^-1
CS J=2-1
C³⁴S	11 600(100)	-26.2	14.0	0.55
C³⁶S	96(21)	-26.2^b	14.0^b	0.55^b
C³⁶S/C³⁴S	8.3(1.8 $)\times 10^{-3}$ ^d
CS J=3-2
C³⁴S	22 190(93)	-26.0	14.5	0.64
C³⁶S	170(81)	-26.0^b	14.5^b	0.64^b
C³⁶S/C³⁴S	7.7(3.7 $)\times 10^{-3}$ ^d
SiS J=5-4
Si³⁴S	3180(80)	-26.4	14.4	0.82
Si³⁶S	41(9)	-26.4^b	14.4^b	0.82^b
Si³⁶S/Si³⁴S	12.9( $2.8)\times 10^{-3}$ ^d
SiS J=6-5
Si³⁴S	4280(70)	-26.5	14.1	0.76
Si³⁶S^c	40(18)	-26.5^b	14.1^b	0.76^b
Si³⁶S/Si³⁴S	9.3(4.2 $)\times 10^{-3}$ ^d

^a The ratio between the intensities at the central velocity of the line and at the velocity of the horns (i.e. maximum blue or red shifted emission); ^b fixed to values obtained for the C³⁴S or Si³⁴S lines; ^c simultaneous fit with a blended, unidentified line at $\nu=103.2804$ GHz and an intensity of 46(18) K km s^-1; ^d From the integrated intensities yielded by the fits to the lines of ³⁴S- and ³⁶S-bearing species. The error given is the 1 $\sigma$ error from the fit and does not contain an estimate of systematic errors, e.g. due to baseline uncertainties.

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