a = load('kanala6.mat');
b = load('kanalb6.mat');
var =  permute(1:16337,[2 1]); %16337
Ue = a.A;
Ua = b.B;
xdata = var*a.Tinterval-a.Tinterval;
ydata = Ua(var)./Ue(var);
figure
hold
plot(xdata, 1/sqrt(2));
plot(20, 0:2);
plot(xdata,ydata(var),'r');
plot(xdata, smoothdata(ydata,'rloess'),'b');
xlim([0 3000]);
ylim([0 1.5]);
set(gca,'xscale','log')
grid on;
hold off;