Is there any way to restrict my graph?

Hi, I need to plot several signs in one plot, about 20-30 signals in one graph. I want all the signals to be clear (more or less) so i need a way to restrict the signs. Is there any way i can do it? To be clearer, i want to plot about 25 signals in the same graph and all to be one after the other .I'm adding an image to emphasize what i need: [IMG]http://i40.tinypic.com/335blll.png[/IMG]