data=load('dowling.dat');
order=2;
i=1:length(data);
filtered_data3 = filtering(data, 512, 3, order);
filtered_data20 = filtering(data, 512, 20, order);

difference3=abs(data-filtered_data3);
difference20=abs(data-filtered_data20);

mean3=mean(difference3)
mean20=mean(difference20)