paint off, one pixel: RMS over 32 levels
  box k (exact): k=2 0.1443, k=3 0.0962, k=4 0.0722, k=6 0.0481
  decay 20 ms: Parseval floor 0.1545, the best sequence 0.1768 (its policy run: 0.1768), greedy 0.1859, best lattice C/N = 2/5 0.1956, flip every frame 0.2006, white 0.2563
  decay 40 ms: Parseval floor 0.0829, the best sequence 0.1037 (its policy run: 0.1037), greedy 0.1089, best lattice C/N = 5/8 0.1167, flip every frame 0.1616, white 0.1850
  decay 80 ms: Parseval floor 0.0423, the best sequence 0.0559 (its policy run: 0.0559), greedy 0.0584, best lattice C/N = 5/13 0.0659, flip every frame 0.1489, white 0.1315
