Table 2: Gaussian fit parameters to azimuthal averages of the primary calibrator beam maps.
Night Wavelength Main Beam Error Beam

( $\mu$ m) FWHM ( $^{\prime \prime }$ ) Relative peak FWHM ( $^{\prime \prime }$ ) Relative peak

7th Jan. 2002 450 9.0 0.952 32.4 0.048

850 15.3 0.986 65.7 0.014

5th June 2002 450 8.4 0.928 25.8 0.072

850 15.0 0.982 58.2 0.018

**Table 2:** Gaussian fit parameters to azimuthal averages of the primary calibrator beam maps.
Night	Wavelength	Main Beam	Error Beam
	( $\mu$ m)	FWHM ( $^{\prime \prime }$ )	Relative peak	FWHM ( $^{\prime \prime }$ )	Relative peak
7th Jan. 2002	450	9.0	0.952	32.4	0.048
	850	15.3	0.986	65.7	0.014
5th June 2002	450	8.4	0.928	25.8	0.072
	850	15.0	0.982	58.2	0.018

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