N, RMSE, Max 4,2.085,4.3717 6,1.0504,2.7178 8,0.73861,1.9048 10,0.52947,1.3873 12,0.33106,0.90165 14,0.23003,0.61658 16,0.155,0.41775 18,0.10284,0.27847 20,0.069779,0.18814 22,0.04679,0.12642 24,0.031399,0.08485 26,0.021144,0.057098 28,0.014194,0.038359 30,0.009538,0.025777