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You will have to see what is at the end of each of them and the beginning. There is no inherent reason for a half page space.
You might download a book from the MR library and see how they begin and end.
The books tend to have the long book broken up with files in chapters. Since the reader will try to reformat at any change, reformatting the whole file when you only really need to reformat the chapter you are reading tales time. Reformatting only a small file takes less time, so the books are broken up by chapters, typically.
Also older readers may not open up any epub with any file much bigger than 250k.
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