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Help inputting gamma function, or any integral, into grapher

Hi,

I need help graphing gamma functions. I (think I) know what the graph of a gamma function should look like (see attached thumbnail).

I cannot figure out how to input the gamma function into my graphing program so as to get a graph like this.

Anyone know how to do this? Or to input any integral function for that matter?

For reference, the gamma function is given as:

$\displaystyle \Gamma(z)=\int_{0}^{\infty}t^{z-1}e^-t$

Thanks