# How can I set default font size to [bp] instead of [pt] in order to use Lyx with XeTex?

I want to use the [bp] font size for the whole document in Lyx 2.0.4 for compilation with XeLatex. My LaTex preamble looks like this: \usepackage{fontspec} \usepackage{xunicode} \usepackage{xltxtra} \date{}. If I specify \documentclass{article}[12bp] I get these errors: LaTex Error: Two \documentclass or \documentstyle commands and LaTex Error: Missing \begin{document}.

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I would just use 12pt (\documentclass[12pt]{article}), that's quite close, but well supported. –  Heiko Oberdiek Nov 27 '12 at 22:20
If I do that I get LaTex Error: Two \documentclass or \documentstyle commands. But I want to use [bp], as I said, not [pt]. Is that even possible (avoiding the error, of course)? –  riderplus Nov 27 '12 at 22:23
The error: consult the documentation of LyX. Using bp instead of pt: You would have to redefine lots of macros (all font size commands, ...), because pt is the standard unit in TeX, not bp. –  Heiko Oberdiek Nov 27 '12 at 22:25
I couldn't find anything related to that errror. So there's no easy way of using bp instead of pt. That's a pity, MSWord uses bp and it would make it difficult for me to write my thesis, I would end up filling less space. –  riderplus Nov 27 '12 at 22:31
@riderplus The reduction in font size is marginal. Hopefully, your are evaluated by content, and not turned down because the thesis is a line too short. –  Sveinung Nov 27 '12 at 22:48