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It is shown, that fitting parameters of a $\bar{K}N$ interaction model todifferent sets of experimental data can lead to physical conclusions whichmight provide a deeper insight into the physics of this multichannel system.The available experimental data are divided into three parts: the "classical"set consisting of the low-energy $K^-p$ cross sections and the thresholdbranching ratios, the SIDDHARTA $1s$ level shift in kaonic hydrogen and theCLAS photoproduction data. We have fitted the parameters of the potential todifferent combinations of these data. We found, that the two polescorresponding to the $I=0$ nuclear quasi-bound state ($\Lam$) and to the $K^-p$$1s$ atomic level seem to resist to their simultaneous reproduction at theright place, though a more or less satisfactory compromise can be achieved.Potentials with the $\Lam$ pole pinned down close to the PDG value fail toreproduce the classical two-body data with an acceptable accuracy. We alsoadded comments on two papers criticizing the potential used in the fits.

Lessons from fitting the lowest order energy independent chiral based $\bar{K}N$ potential to experimental data