Table 6: Abundance ratios in the shocked regions and in the cloud, as derived from the column densities of Table 3. References for other outflows: L1157-B1 and L1157-B2: Bachiller & Perez Gutierrez (1997); CB3: Codella & Bachiller (1999); L1448, B1 and CepA: Martin-Pintado et al. (1992); NGC 2071: Chernin & Masson (1993).
Region $\rm SO/H_{2}CO$ SO2/SO $\rm SO_{2}/H_{2}CO$ H2S/SO SiO/SO SiO/SO2 $\rm SiO/H_{2}CO$
Cloud 28 $\sim$0.04 1 $\sim$0.03 $\sim$ $4 \times 10^{-4}$ 0.01 0.01
E1 2 0.5 1.1 $\leq$6 0.03 0.06 0.06
E2(LVC) $\geq$4 $\leq$0.1 - $\leq$80 0.06 $\geq$0.5 $\geq$0.2
E2(HVC) $\geq$5 $\leq$0.1 - $\leq$150 0.1 $\geq$0.9 $\geq$0.5
W1 7 0.1 0.7 $\leq$3 $6\times 10^{-3}$ 0.06 0.04
W2 2.5 0.3 0.8 $\leq$9 0.02 0.05 0.04
L1157-B1 0.6-1 0.6-1 0.4-1 0.8-1.3 0.2-0.3 0.3 0.1-0.3
L1157-B2 1 1-3 1-3 0.7-2 0.1-0.4 0.1 0.1-0.4
CB3 - $\sim$1 - $\leq$1 $\ll$1 $\ll$1 -
L1448 - - - - 0.3 - -
B1 - - - - 0.1 - -
CepA - - - - 0.08 - -
NGC 2071 - - - - 0.01-0.05 - -


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