Table 17 Score selection. W _m (W _ms ) is the score for matching (mismatching) bases. Other notations are given in the text.

${\Delta }_1-1<\frac{W_c-W_{nc}}{W_m-W_{ms}}<{\Delta }_1$

${\Delta }_2+\frac{W_m}{W_m-W_{ms}}-1<\frac{W_c-W_{nc}+W_g+W_s}{W_m-W_{ms}}<{\Delta }_2$

${\Delta }_3-1<\frac{2W_c-W_{nc}}{W_m-W_{ms}}<{\Delta }_3$

${\Delta }_4-1<\frac{-W_c}{W_m-W_{ms}}<{\Delta }_4$

${\Delta }_5-1<\frac{2W_c-W_{nc}-W_g-W_s}{W_m-W_{ms}}<{\Delta }_5-\frac{W_m}{W_m-W_{ms}}$

${\Delta }_6+\frac{W_m}{W_m-W_{ms}}-1<\frac{W_g+W_s-W_c}{W_m-W_{ms}}<{\Delta }_6$