    N    |bias| / σ  (gamma0, gamma1)
         plain           extrapolated
   64   71.0245 39.9694   6.18526 4.78117
  128   18.1219 10.0159   0.45655 0.37367
  256   4.5500 2.5012   0.02884 0.02365
  512   1.1386 0.6251   0.00181 0.00148
 1024   0.2847 0.1562   0.00011 0.00009
bias ∝ N^-1.99 (gamma0), N^-2.00 (gamma1)
