  Combining results on single-particle distributions with those of the
  Bose-Einstein correlation analysis in the same experiment, the space-time
emission function is extracted as a function of time and longitudinal
coordinate, as well as a function of transverse coordinates.
  While the former function resembles a boomerang for both types of collision
(only shifted in the time direction due to the larger freeze-out time in
heavy-ion collisions), the latter function is Gaussian for heavy-ion
collisions, but ring-shaped for hadron-hadron collisions.
