diameter symbol in lyx 1.1.5

[Wolfgang Kilian]

hello all you freaks,
 i tried to crate a diameter symbol (/o on each oterh) in lyx 1.1.5.fix1.
 What i did was in math mode a '\not o' and in lyx it seemd to be ok. But in PS it 
looked like '/o'. Schould i write the complete math mode in red ie:

 $\not o$

Thanks in advance

Wolfgang
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