# Sans-serif font different in output

I am currently using Lyx. I was typing with sans-serif font and the interface shows it like the Arial font. However, the output is different; it's still sans-serif but the letters have more spaces in between. How can I make the output like the Arial font in Microsoft?

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Please, post some part of the code. To write in sans-serif you have to use `\textsf{}` –  Sigur Jun 29 '12 at 21:16