Beam-deconvolved Planck LFI maps
  The Planck Collaboration made its final data release in 2018. In this paper
we describe beam-deconvolution map products made from Planck LFI data using the
artDeco deconvolution code to symmetrize the effective beam. The deconvolution
results are auxiliary data products, available through the Planck Legacy
Archive. Analysis of these deconvolved survey difference maps reveals signs of
residual signal in the 30-GHz and 44-GHz frequency channels. We produce
low-resolution maps and corresponding noise covariance matrices (NCVMs). The
NCVMs agree reasonably well with the half-ring noise estimates except for 44
GHz, where we observe an asymmetry between $EE$ and $BB$ noise spectra,
possibly a sign of further unresolved systematics.
