st: "sort" over different variables

[<Sim.Oertel@t-online.de>]

Dear All,
I have a quick (and probably simple) question: I would like to "sort" my
dataset over several variables. At the moment my dataset looks like this
(very simplified example):

Var1   Var2   Var3    Var4 
1000   3000   2000    500

And should look like this:

Var1    Var2    Var3    Var4
500      1000    2000    3000    

Thank you for any advice and help.
Simon

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