Default 2 * max_area * PCMSmearingFactor
Defines the number of nearest neighbor mesh-points to be taken around each cavity tessera in order to smear the charge when PCMCalcMethod = pcm_poisson. Setting PCMChargeSmearNN = 1 means first nearest neighbors, PCMChargeSmearNN = 2 second nearest neighbors, and so on. The default value is such that the neighbor mesh contains points in a radius equal to the width used for the gaussian smearing.
hamiltonian/pcm.F90 : 1046
call parse_variable(namespace, 'PCMChargeSmearNN', default_nn, pcm%tess_nn)