  The first measurement of kaon phase space densities are presented as a
function of transverse mass, center of mass energy and the number of
participants. The kaon phase space density increases with the number of
participants from e+e- to Pb+Pb collisions. However the ratio of the kaon and
pion phase space densities at low transverse momentum is independent of the
number of participants for sqrt{s}=17GeV/nucleon
  This paper is dedicated to Francis Riccardelli, engineer for the Port
Authority, who died on September 11th 2001 while evacuating others.
