Plot 2D data and enhance visualization?

I need to plot two large matrices together and "enhance" visualization. I know how to smooth, but am supposed to end with a plot that looks like the attached file "plot.jpg." However, I keep getting what I attached as "24JUN.jpg." Data files are too large to attach. Here is what I have for code:

c=load('24jun015.tda');
d=load('24jun019.tda'); 

altitude15=c(2:875,2:562);

altitude19=d(2:516, 2:562);

x3=smoothdata(altitude15);
x4=smoothdata(altitude19);
x5=c(2:40,2:40);

%plotting smoothened version of 24JUN015
figure; 
subplot(2,1,1) 
plot(x3)
title('24JUN015')
xlabel('Time (seconds)')
ylabel('Altitude')

%plotting smoothened version of 24JUN015
subplot(2,1,2)
plot(x4)
title('24JUN019')
xlabel('Time (seconds)')
ylabel('Altitude')

%plotting smoothened versions together with axis constraints
figure;
plot(x3);
hold on;
plot(x4);
axis ([0 500 0 1100])

[Walter Roberson]

You are asking to do 561 line plots, one for each column of x3. The plot given as desired is clearly not a line plot. Perhaps you are looking for imagesc()