double BCAL_tdiff_res(double geometric_mean, int ilayer)
{
	double &x = geometric_mean;
	switch(ilayer){
		case 1:
			return 0.0420896+(0.334871/(pow(x,0.172408)-1.68388));
			break;
		case 2:
			return 0.0956571+(0.161849/(pow(x,0.137689)-1.61827));
			break;
		case 3:
			return 0.433442+(637.338/(pow(x,1.69552)-248.665));
			break;
		case 4:
			return 100.0;
			break;
		case 5:
			return 100.0;
			break;
		case 6:
		case 7:
		case 8:
		case 9:
		case 10:
			return 100.0;
	}

	return 1000.0;
}