i plotted 7 graphs in single one,but the amplitude of the plots are very small(attaching a model), how can i increase the amplitude without changing X-axis..?

increase the amplitude of the graph with out changing X-axis

[dpb]

What property of the graph, specifically, does "amplitude" refer to? If the range of values on the y-axis, then refer to

doc ylim

If the actual size of the axis, then the figure size and/or axes 'position' properties control. Can only answer specific what is asked unambiguously--we can't see your figure or know more of what you expect than what you tell us.