xubuntu minimum system requirements

[Zatlite Minthar]

Hi,
 
Can any one tell me what's the absolute minimum system requirements for xubuntu in terms of disk space, processing power and memory?
I've an old machine I'd like to use again and wondering if I can use xubuntu instead of puppy linux or damnsmalllinux.
The machine is 400mhz processor, 256MB memory and has a 4GB harddrive. 
I don't want to install everything that comes with ubuntu. Just openoffice if the machine can handle it and firefox. 
 
Thanks.
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