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We report on the investigation of modifications of basic properties of K$^+$and K$^-$ mesons emitted from collisions of Ni+Ni at beam energy of 1.91A GeV.Experimental K$^-$/K$^+$ ratio are presented in a wide range of phase spaceparameterized by kinetic energy and emission angle in the nucleon-nucleoncentre of mass. The $v_1$ component of the azimuthal distribution was extractedas a function of rapidity and transverse momentum for central, andsemi-peripheral collisions. A comparison of these patterns with the HSDtransport model favours the existence of the kaon-nucleon in-medium potential.For the IQMD model, this interaction scenario is confirmed in case of K$^-$,whereas for K$^+$ the picture is less clear.

Nuclear medium modifications of properties of kaons measured around threshold with FOPI