private int CoverageToModulus(uint coverage)
{
if (coverage > 90) return 1;
if (coverage > 80) return -10;
if (coverage > 75) return -5;
if (coverage > 66) return -4;
if (coverage > 50) return -3;
if (coverage > 33) return 2;
if (coverage > 25) return 3;
if (coverage > 20) return 4;
if (coverage > 10) return 5;
return 10;
}