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Fig. 3


Restrictions on the parameters M and a given by the ER, ER1 - ER5 models due to the QPO data simultaneously observed in the microquasar GRO J1655-40. The solid lines are given by the 3νL ~ 2νU twin HF QPOs resonance, while the dashed lines are obtained for the nodal frequency νnod that explain the LF QPOs at the same r3:2 radius. The crossing of the twin HF QPO and the LF QPO limits implies the mass and spin of the black hole. The optical mass limit is shaded.

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