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We continue exploring the constraining capabilities of X-ray reflectionspectroscopy to test the Kerr-nature of astrophysical black holes and wepresent the results of our analysis of two NuSTAR observations of Cygnus X-1 inthe soft state. We find that the final measurement can strongly depend on theassumption of the intensity profile. We conclude that Cygnus X-1 is notsuitable for tests of general relativity using X-ray reflection spectroscopyand we discuss the desired properties of a source to be a good candidate forour studies.

Testing the Kerr hypothesis using X-ray reflection spectroscopy with NuSTAR data of Cygnus X-1 in the soft state