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We give the calibration and scientific performance parameters of the PlanckLow Frequency Instrument (LFI) measured during the ground cryogenic testcampaign. These parameters characterise the instrument response and constituteour best pre-launch knowledge of the LFI scientific performance. The LFI showsexcellent $1/f$ stability and rejection of instrumental systematic effects;measured noise performance shows that LFI is the most sensitive instrument ofits kind. The set of measured calibration parameters will be updated duringflight operations through the end of the mission.

Planck pre-launch status: Low Frequency Instrument calibration and expected scientific performance