tokens: We are grateful to Paweł Moskalik for stimulating discussions, reading the manuscript and detailed comments. Fruitful conversation with Wojtek Dziembowski is also acknowledged. This research is supported by the Polish National Science Centre through grant DEC-2012/05/B/ST9/03932 and by the Polish Ministry of Science and Higher Education through the program ‘Ideas Plus’ award no. IdP2012 000162. The OGLE project has received funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 246678 to AU.
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