The Gaussian pion (blue circles) and kaon (green crosses) radii for spherical ($S_{\rm T}>0.7$) and jet-like ($S_{\rm T}<0.3$) events as function of the average pair transverse mass $m_{\rm T}$ for different multiplicity intervals. The lines approximating the pion and kaon radii by the linear function of Eq. (10) are shown for spherical events by dotted blue and green lines, respectively, and for jet-like events by dotted-dashed lines. The lines for combined fit for pion and kaon points are shown by black solid and dashed lines for spherical and jet-like events, respectively. Statistical (bars) and systematic (boxes) uncertainties are shown.