@bourtzovlakas: You'll have to be more specific about what the problem is. I can open the file and do OCR just fine (maybe I don't know Greek to be able to tell something's wrong?). The only problem I see is that lines look close to each other, but all you have to do in this case is set the min interline height in the advanced OCR setup to a small value (it works with a 2 here).
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