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tokens: Acknowledgements Based on observations obtained in the framework of the ESO Prgs. 097.D-0233(A) and 098.D-0185(A). LS acknowledges financial contribution from the grant from PRIN-INAF 2014 ‘Towards a unified picture of accretion in High Mass X-Ray Binaries’. AK acknowledges financial support from RFBR grant 16-02-00604A. We thank the referee Jerzy Madej for his useful comments.