Planck early results
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Table 4

Comparison of pre-launch calculations and measured parameters for the HFI optical beams, averaged by frequency band.

FWHM [′] Ellipticity
Band Expected Mars σ Mars Expected Mars σ Mars

100P ......... 9.58 9.37 0.06 1.17 1.18 0.006
143P ......... 6.93 6.97 0.10 1.06 1.02 0.004
143 ......... 7.11 7.24 0.10 1.03 1.04 0.005
217P ......... 4.63 4.70 0.06 1.12 1.13 0.006
217 ......... 4.62 4.63 0.06 1.10 1.15 0.010
353P ......... 4.52 4.41 0.06 1.08 1.07 0.009
353 ......... 4.59 4.48 0.04 1.23 1.14 0.007
545 ......... 4.09 3.80 ... 1.03 1.25 ...
857 ......... 3.93 3.67 ... 1.04 1.03 ...

Notes. Standard deviations σ are computed as the dispersion between the Saturn, Jupiter, and Mars data for each given channel.

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