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Measurements of the observed cross sections for e+e -> exclusive light hadrons containing K^S_0 meson at \sqrt{s} = 3.773 and 3.650 GeV

By analyzing the data sets of 17.3 pb$^{-1}$ taken at $\sqrt s= 3.773$ GeV and of 6.5 pb$^{-1}$ taken at $\sqrt s= 3.650$ GeV with the BES-II detector at the BEPC collider, we measure the observed cross sections for the exclusive light hadron final states of $K_S^0K^-π^+$, $K_S^0K^-π^+π^0$, $K_S^0K^-π^+π^+π^-$, $K_S^0K^-π^+π^+π^-π^0$, $K_S^0K^-π^+π^+π^+π^-π^-$ and $K_S^0K^-π^+π^0π^0$ produced in $e^+ e^-$ annihilation at the two energy points. We set the upper limits on the observed cross sections and the branching fractions for $ψ(3770)$ decay to these final states at 90% C.L..