At the COSY-11 installation, the total cross section for the reaction pp->ppK+K- has been determined at four excess energies below the Phi production threshold: eta = 6 MeV (with very low statistics), 10 MeV, 17 MeV, and 28 MeV. To complete the COSY-11 study on the K+K- mesons, we propose to measure the pp->ppK+K- reaction at eta = 3 MeV and eta = 6 MeV in order to test the interaction in the four-body ppK+K- system, which is expected to show up at eta lower than 10 MeV.
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