How floor1_inverse_dB_table is calculated?

[lassade]

Hi

I'm trying to calculate the floor1_inverse_dB_table, but I was unsuccessful, heres how I'm calculating it:

for (int i = 0; i < 256; i++) {
  floor1_inverse_dB_table[i] = pow(10.0, 0.05 * (140.0/256.0 * (i+1) - 140.0));
}

but this generates values that are slightly off from the values in the spec

1.0649856e-07, 1.1341944e-07, 1.2079008e-07, 1.2863970e-07 // generated from the code above
1.0649863e-07, 1.1341951e-07, 1.2079015e-07, 1.2863978e-07 // from spec

The difference is small, but I can't say why that is.