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In a reflowabe format, there is a logical page, i.e. the contents of the documents between two hard (forced) page breaks. This logical page will be split into any number of physical pages that depend on the size of the screen of the device used to view the file as well as the font size being used.
lines per screen = number of pixels in the physical screen in the vertical direction/number of pixels per line in the vertical direction
You cant change the numerator. You can change the denominator by changing the font size, but since the reader can also change font sizes, your setting will only make sense at one size
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