**Table 1:** Observed line parameters in IRC +10216.
	Cal. Freq.	Obs. Freq.	$v_{\rm exp}$ ^a	$\int$ $T_{\rm MB}$ dv
Transition	(MHz)	(MHz)	(km s^-1)	(K km s^-1)
PH₃
$J_{\rm K}$ = 1₀-0₀	266944.514	266944.5(3)	14.1(3)	1.002(40)
SiS v = 4
J = 15-14	266941.754	266942.4(7)	4.0(7)	0.237(40)
J = 14-13	249155.372	249155.6(4)	3.5(4)	0.172(40)
J = 13-12	231366.976	231367.2(3)	2.7(3)	0.256(30)
J = 12-11	213576.710	213576.9(5)	3.5(5)	0.207(40)

N OTE. Number in parentheses are 1 $\sigma$ uncertainties in units of the last digits. Observed frequencies are given in the rest frame of IRC +10216 assuming a systemic velocity of $v_{\rm LSR}$ = -26.5 km s^-1.
^a $v_{\rm exp}$ is the half width at zero level.

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