Having more graphs in X-Y graph ( effect of variable parameter)

Dear friends

I am using a solar cell in a simple circuit in Simulink and I want to give more than one constant value as my input (irradiance). I mean that I want to plot my graphs in one plot pane, one graph with input of 1000 and another one wih 500. Is it possible ? Generally how can I generate my output with such a matlab input 0:500:1000 but in Simulink.

Kind regards, Hamed