Table 3:

Notes. ^(a) The data presented correspond to monchromatic beams at band centre. The HFI spider-web bolometers are slightly polarised and therefore they are also included in this table.
^(b) The uncertainty in the angle of the principal plane of polarisation, at focal plane level (the systematic uncertainty of a rigid rotation of the focal plane is very low as it will be measured in-flight very accurately, see Sect. 7). The differences between the design angle and the angle measured at focal plane level are within 3 for HFI; the measurement was made using a source which filled the beam to -20 dB. For LFI the 1 angle uncertainty is estimated from the mechanical manufacture and assembly tolerances, plus a model of thermoelastic deformations. However, the total angle uncertainty for LFI detectors may be dominated by cross-polar effects in the optical chain (telescope, horn, and mainly OMT) rather than the mechanical tolerances (see Sect. 4 and Leahy et al. 2010).
^(c) The fraction of power detected from incident radiation linearly polarised in the direction orthogonal to the principal plane of polarisation and hence contributing to apparent depolarisation.
^(d) Maximum RF power reaching one detector minus that reaching the orthogonal detector, normalised to the highest of the two (this definition is a factor of 2 larger than the leakage of Stokes I to Q ( ) defined in Leahy et al. 2010).