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Also you are dividing by 0, when T is 0. Try Plot[5/2 + (3354/t)^2 (E^(-3354/t)/(1 - E^(-3354/t))^2), {t, 1, 2500}] ![enter image description here][1] [1]: /c/portal/getImageAttachment?filename=59381.JPG&userId=366611