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Table 4:

Key polarisation parameters of the LFI beams.

Feed 		Band Side arm Main arm Difference
    $\eta_{\rm s}$a $\delta_{\rm s}$a $\eta_{\rm m}$a $\delta_{\rm m}$a $\bar{\eta}$a $\bar{\delta}$a $\langle{\cal M}_{QI}\rangle /\langle{\cal M}_{II}\rangle$b Max( ${\cal M}_{QI}$)c Max( ${\cal M}_{QU}$)c
LFI-   10-3 $^\circ $ 10-3 $^\circ $ 10-3 $^\circ $ 10-3 % %
18   1.91 0.23 2.03 0.23 1.97 0.23 -0.42 -0.82 1.75
19   1.33 0.09 1.46 0.09 1.40 0.09 -0.30 -0.75 1.19
20 70 GHz 1.06 -0.02 1.15 -0.02 1.11 -0.02 -0.15 -0.43 -1.11
21 1.05 0.02 1.11 0.02 1.08 0.02 -0.07 -0.31 1.14
22   1.33 -0.09 1.46 -0.09 1.39 -0.09 -0.29 -0.73 -1.22
23   1.91 -0.33 2.02 -0.33 1.96 -0.33 -0.34 -0.77 -2.04
24   1.84 0.00 1.70 0.00 1.77 0.00 0.27 1.43 1.05
25 44 GHz 4.58 -0.35 4.46 -0.35 4.52 -0.35 0.03 -2.14 -5.30
26   4.58 0.35 4.45 0.35 4.52 0.35 0.02 -2.16 5.32
27 30 GHz 2.19 -0.18 2.07 -0.18 2.13 -0.18 0.06 0.75 -1.87
28 2.19 0.18 2.07 0.18 2.13 0.18 0.05 0.76 1.86

Notes. All values are derived from beam models calculated assuming the adopted flight model telescope geometry (RFFM), evaluated at the nominal band-centre frequencies. (a) beam-averaged cross-polar leakage $\eta $ and rotation $\delta $; (b) beam-averaged forward polconversion as a fraction of the integrated gain; (c) absolute maximum values of the leakage for I and $U_{\rm H}$ into $Q_{\rm H}$.


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