Position-space curved-sky anisotropy quadratic estimation
  This document supplements the release of the Planck 2018 CMB lensing
pipeline, now made publicly available. It collects calculations relevant to
curved-sky separable quadratic estimators in the spin-weight, position-space
correlation function formalism, including analytic calculations of estimator
responses and Gaussian noise biases between arbitrary pairs of quadratic
estimators. It also contains the derivation of optimal, joint gradient and curl
mode quadratic estimators for parametrized anisotropy of arbitrary spin.
