tokens: This work was supported in part by the DeutscheForschungsgemeinschaft (DFG) via SFB 956. It was also partly supported by fruitful discussions with members of the Czech Science Foundation DFG collaboration (No. 13-00070J) and with members of the European Union Seventh Framework Program (FP7/2007-2013) under grant agreement no 312789; Strong gravity: Probing Strong Gravity by Black Holes Across the Range of Masses.
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