help with sed

Ive been trying to use sed to change an output file from a model im working with. The model outputs some data to a text file and for some reason, outputs zero as .0000 , which gives me a probelem with my graphics package (it needs to be 0.0000). Ive tried using sed with the command :

sed 's/ .0/0.0/g'

but it doesnt properly work. It changes 0.* to 0.0.* as well! Is there something im missing? Is there a proper way of specifying blank spaces?

Thanks in advance

you need to escape the first '.', other wise it matches "any character"

Code:

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sed 's/ \.0/0.0/g'

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[edit]please, don't crosspost.[/edit]