Particle ratios \kx/\pix, \kzs/\pix (top) and \ks/\pix, $\phi$/\pix (bottom) as a function of \pt measured in \pp collisions at \sppt{13}. The measured ratio is reported together with that obtained from transverse mass (\mT) scaling of charged pions shown as a solid line. The shaded red band indicates the constant fit, in the \pt region where it was performed, which is used to determine the constant offset parameter $c$. See the text for details. The \ph spectrum in \pp at \sppt{7} is from Ref.