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We consider twin-peak quasi-periodic oscillations observed in the accretinglow-mass neutron star binaries and explore restrictions to central compactobject properties that are implied by various QPO models. For each model andeach source, the consideration results in a specific relation between thecompact object mass $M$ and the angular-momentum $j$ rather than in theirsingle preferred combination. Moreover, restrictions on the models resultingfrom observations of the low-frequency sources are weaker than those in thecase of the high-frequency sources.

Restrictions to neutron star properties based on twin-peak quasi-periodic oscillations