$R$ (left panel) and $\lambda$ (right panel) parameters as a function of pair transverse momentum $k_{\rm T}$ extracted in K$^+$K$^-$ analysis with free parameters (mass and couplings) for $f_0$(980) and Achasov~ parameters for $a_0$(980) The parameters are compared to those obtained for identical charged kaons~ Statistical (bars) and systematic (boxes) uncertainties are shown.