[pstricks] pst-plot commands

[Jose Antonio]

Hi all:

 How can I plot in the same curve other curves. i.e. :
                f(x)= (1/x^12) - (1/x^6) --> Lennard-Jones potential
                g(x)=(1/x^12) ---> Repulsive part
                h(x)=-(1/x^6) ---> Attractive part
I don't understand very the order of the command: div sub exch ...
and finally where can I get this information.

Thanks in advance.
jamr

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