Table 3
Band averaged effective beam solid angles under a Gaussian approximation.
| Band | Ωeff | Spatial variation |
|
Spatial variation |
|
Spatial variation | FWHM eff | Spatial variation | ||||||||
| (arcmin2) | (arcmin2) | (arcmin2) | (arcmin2) | (arcmin2) | (arcmin2) | (arcmin) | (arcmin) | |||||||||
|
|
||||||||||||||||
| 30 | 1190.06 | 0.69 | 1117.3 | 1.8 | 1188.93 | 0.70 | 32.408 | 0.009 | ||||||||
| 44 | 832.00 | 34.00† | 758.0 | 32.0† | 832.00 | 35.00† | 27.100 | 0.570† | ||||||||
| 70 | 200.90 | 0.99 | 186.1 | 1.8 | 200.59 | 0.99 | 13.315 | 0.033 | ||||||||
| 18/23 | 210.13 | 0.63 | 194.2 | 2.6 | 209.82 | 0.64 | 13.618 | 0.020 | ||||||||
| 19/22 | 199.19 | 0.64 | 185.0 | 1.6 | 198.90 | 0.64 | 13.259 | 0.021 | ||||||||
| 20/21 | 192.58 | 0.67 | 179.1 | 1.9 | 192.27 | 0.67 | 13.037 | 0.023 | ||||||||
| 25/26 | 1019.63 | 0.65 | 942.2 | 2.4 | 1019.05 | 0.64 | 29.998 | 0.009 | ||||||||
Notes. Ωeff is the beam solid angle estimated up to a radius equal to the main beam radius. FWHMeff is the effective FWHM estimated from Ωeff. 
is the beam solid angle estimated up to a radius equal to the FWHMeff, while 
indicates the beam solid angle estimated up to a radius = 2 × FWHMeff.
The large spatial variation associated with the 44 channel is due to the combination of beams with very different shapes and orientations, due to the different location of horn 24 with respect to horns 25 and 26 in the focal plane (Sandri et al. 2010). Indeed, the value associated with the quadruplet 25/26 (the spatial variation of the 24 is about 0.78 arcmin2) is in line with other quadruplets.
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