Hoi Ric, what means 'it works'? Yes, the energy spectrum of gammas from K0S will be fine by construction, but that is not relevant to the analysis. http://www.slac.stanford.edu/~ursl/talks/102502/mm2-mc.eps shows plots comparing B0 cocktail MC (left: o 2001 - 2000, right: o 2002 - 2001) when applying the K0s killing. 2000 and 2001 MC contain only 'old' MC, 2002 only 'new'. There are still differences between the killed old and the new. Cheers, --U.