**Table 1:** Observational parameters.
Receiver	$T\rm {_{sys}}^{(a)}$	$\tau$	Tot. integr.	$\rho^{(b)}$	Telescope	1 $\sigma$ (rms)	Band	Frequency
frequency			time (on/off)		beam HPBW	noise level	width	resolution
(GHz)	(K)		(min)		('')	(mK as $T\rm _A^*$ )	(MHz)	(MHz)
82.720	97	0.04	470	0.78	29	2	490	0.3
106.355	140	0.08	375	0.75	23	3	490	0.3
130.000	217	0.08	310	0.72	19	4	489	0.6
153.630	292	0.14	585	0.68	16	3	488	1.3
200.885	347	0.23	250	0.59	12	5	1023	1.0
224.519	393	0.29	331	0.54	11	5	1023	1.0
248.170	742	0.52	320	0.49	10	9	510	1.3
272.810	762	0.40	575	0.44	9	7	510	1.3

^(a) Average system temperature.
^(b) $T^*\rm {_A} = \rho \it {T} \rm {_{mb}}$ .

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