double BCAL_tdiff_res(double geometric_mean, int ilayer)
{
	double &x = geometric_mean;
	switch(ilayer){
		case 1:
			return 0.198454+(0.264072/(pow(x,0.197505)-1.96031));
			break;
		case 2:
			return 0.289428+(221.236/(pow(x,1.39497)-22.0872));
			break;
		case 3:
			return 100.0;
			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;
}