# File lib/ruote/reader.rb, line 260
    def self.to_raw_expid_radial(tree, expid='0')

      i = -1

      [
        [ expid.split('_').size - 1, expid, tree[0], atts_to_radial(tree[1]) ]
      ] +
      tree[2].collect { |t|
        i = i + 1; to_raw_expid_radial(t, "#{expid}_#{i}")
      }.flatten(1)
    end