>
> No suggestions, but an English tip: the word you want is "lighting".
>
> "Lightning" is the bright streaky stuff that shoots out of storms and 
> causes thunder. :)
Oooops ! That's not really the same...

Thomas : I take all your ideas and my laptop and see what I can do during my 
holidays.

For the chains : I won't use the chain macro you mention. Will try to create 
mine (and create hyperbolic cosinus and not paraboles...) If I can't manage 
it, I'll take this macro.

Thanks for all your suggestions.

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