This should work if you want to display them all in the same figure. This solution will first create a new figure and hold on will allow you to plot multiple time series to the new figure. As you can see, you can index into your matrix to produce vectors representing each channel of your time series.
n = 2000;
c = 4;
x = (1:n)';
figure; hold on;
for i = 1:c
plot(x, data(:, c))
end
hold off
