The study of theI=1,0++states with the OBELIX detector in the channelp¯p→K±KS0&pgr;∓at three different target densities is reported. We discuss in particular the initial state dependence ofa0(980)production and the evidence of an extra scalar state with mass1.29±0.01 GeV/c2and width0.080±0.005 GeV/c2.©1998 American Institute of Physics.