Planck 2018 results. II. Low Frequency Instrument data processing
  We present a final description of the data-processing pipeline for the
Planck, Low Frequency Instrument (LFI), implemented for the 2018 data release.
Several improvements have been made with respect to the previous release,
especially in the calibration process and in the correction of instrumental
features such as the effects of nonlinearity in the response of the
analogue-to-digital converters. We provide a brief pedagogical introduction to
the complete pipeline, as well as a detailed description of the important
changes implemented. Self-consistency of the pipeline is demonstrated using
dedicated simulations and null tests. We present the final version of the LFI
full sky maps at 30, 44, and 70 GHz, both in temperature and polarization,
together with a refined estimate of the Solar dipole and a final assessment of
the main LFI instrumental parameters.
