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Precision when solving a system of differential equations


Hi,

I have a system with three differential equations with time as my variable.
 I would like to control the increment time step as some of my function are
 very stiff. Ideally I would like to use between 10 and 20 millions steps. 
How can I do that?
(version used Mathematica 6.0.1)

Thanks for help
Marc
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