Adjusting TAB setting in vim

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Skribent: Bart Garst
Dato:  
Emne: Adjusting TAB setting in vim
Does anyone know if it's possible to adjust the number of spaces the TAB
key indents in vim? Right now it does 8 but I'd like it at 4.

vim 6.1
RH 8.0

Thx,
Bart