collect   monitor  % diff
  1            1.7654645758421768            1.6990802813400545           -0.6489409930960901            0.0057419219419729            0.0057842642305234
  4            1.9816168574330200            1.9635875796013686           -0.6179140635440881            0.0048255651577103            0.0047800358475283
  0            2.7576665532746141
  3            3.2873770764088017