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line margins in what? A PDF to EPUB conversion?
That would be the line unwrap factor, which is tricky to get right. It means when performing transformation spells on PDF markup to join lines into actual paragraphs, the converter guessed wrong.
That is to say: PDF has no concept of paragraphs, only lines of floating text. Programs have to join everything into a long string and guess where the paragraphs need based on the length of each line.
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