double BCAL_tdiff_res(double geometric_mean, int ilayer)
{
	double &x = geometric_mean;
	switch(ilayer){
		case 1:
			return 0.0672518+(3.27103e+06/(pow(x,3.4566)+4.52313e+06));
			break;
		case 2:
			return 0.0767097+(49421.3/(pow(x,2.48557)+53174.8));
			break;
		case 3:
			return 0.114449+(6.22317e+06/(pow(x,3.36655)+7.8247e+06));
			break;
		case 4:
			return 100.0;
			break;
		case 5:
		case 6:
		case 7:
		case 8:
		case 9:
		case 10:
			return 100.0;
	}

	return 1000.0;
}