Table 4: Observational parameters in 2001 and 2005.
Receivers 3 mm 1 mm

$T_{\rm sys}$ (2001) [K] 400-420 250-350

$\tau_{\rm zenith}$ (2001) 0.25 0.04

$T_{\rm sys}$ (2005) [K] 240-260 220-240

$\tau_{\rm zenith}$ (2005) 0.32 0.09

Line ¹²CO(1-0) ¹³CO(2-1) ¹²CO(2-1)

Frequency [GHz] 115.271 220.399 230.538

Beam size ( FWHM) [arcsec] 21.5 11.1 10.6

Low resolution [MHz] 1.0 not used 1.0

Bandwidth [MHz] 256 not used 256

High res. (2001) [kHz] 39.0 78.0 39.0

High res. (2005) [kHz] 26.4 26.4 26.4

Bandwidth [MHz] 17 17 17

**Table 4:** Observational parameters in 2001 and 2005.
Receivers	3 mm	1 mm
$T_{\rm sys}$ (2001) [K]	400-420	250-350
$\tau_{\rm zenith}$ (2001)	0.25	0.04
$T_{\rm sys}$ (2005) [K]	240-260	220-240
$\tau_{\rm zenith}$ (2005)	0.32	0.09
Line	¹²CO(1-0)	¹³CO(2-1)	¹²CO(2-1)
Frequency [GHz]	115.271	220.399	230.538
Beam size ( FWHM) [arcsec]	21.5	11.1	10.6
Low resolution [MHz]	1.0	not used	1.0
Bandwidth [MHz]	256	not used	256
High res. (2001) [kHz]	39.0	78.0	39.0
High res. (2005) [kHz]	26.4	26.4	26.4
Bandwidth [MHz]	17	17	17

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