Ratio that should be increased for the alignment of more
divergent sequences. A ratio of 0.33 (1/-3) is appropriate
for sequences that are about 99% conserved;
a ratio of 0.5 (1/-2) is best for sequences that are 95%
conserved; a ratio of about one (1/-1) is best for sequences
that are 75% conserved. Default ratio set to 0.66 (2/-3).
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