private static double expectedRelativeError(final int log2m){
  final long m=1 << log2m;
  return 1.1D / Math.sqrt(m);
}

private static double expectedRelativeError ( final int log2m ) { final long m = 1 << log2m ; return 1.1D / Math . sqrt ( m ) ; }
returns the ( max ) expected relative error according ot the hll algorithm docs
