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Thank you very much for your fast solutions! I did not have to try yours, Stefan, as Thorsten's suggestion worked, but thanks anyway. It looks fantastic now!

Dear Lyx experts,

I have a problem with the PDFs produced by LyX. As the attached image shows, formulae are as beautiful as usual in LaTeX, but the text has become jagged. Does anyone know what the cause is and how to remove it? Thank you very much for your efforts!