function [ppstruct] = convert_particles_array2struct(pp,col)
    % [ppstruct] = convert_particles_array2struct(pp,col)
    % Converts MATLAB particle data from 'array' format to 'struct'
    % Input
    %   pp            particle data in 'array' format
    %   col           column map
    % Output
    %   ppstruct      particle data in 'struct' format
    
    % Convert map to (cell) arrays and sort by ascending array indices
    [colvals,idx] = sort(cell2mat(col.values));
    colkeys = col.keys;
    colkeys = {colkeys{idx}};
    nkeys = col.Count;
          
    nstep = size(pp,3);
    for istep=nstep:-1:1
      for ikey=1:nkeys
        ppstruct(istep).(colkeys{ikey}) = pp(colvals(ikey),:,istep);
      end
    end
end