Problem with command Fill

Hi

I have problem when using fill. I suppose it may be related with floating. If I reduce values of timescale I get the desired result, but I want to keep my original xaxis (another people have to use data and graphic output). Is there a way to solve my problem?

For example

clc clear all

%definition

t=733700:0.01:733715;y=0.5*sin(2*pi/(12.42*0.05)*t);

y1=0.45*sin(2*pi/(12.42*0.05)*t);y2=0.55*sin(2*pi/(12.42*0.05)*t);

%prepare for filling

T=[t,fliplr(t)];Y=[y1,fliplr(y2)];T_n=[t-t(1),fliplr(t-t(1))];

%graph

figure

subplot(2,1,1)

fill(T,Y,'r','EdgeColor','none','FaceAlpha',0.5);hold on;plot(t,y)

subplot(2,1,2)

fill(T_n,Y,'r','EdgeColor','none','FaceAlpha',0.5);hold on;plot(t-t(1),y)

Thanks in advance