Develop a plot of a cubic spline fit of the followingdata with (not-a-knot end conditions.4000.82436 1.00000 0.735761000f(x) 0.406 0.19915 0.09158compare your plot with the following equationwhich was used to generate the data:f (x) = (x/200)e^(-x/200+1)Matlab use is suggested.