Normally, you would want your Delta's to be as high as possible. This indicates a big gap between the top match and the second match.
But what if it is zero? Does it then mean that there is only a single match? Is that good or bad?
If it is zero, there should be not second hit. Perhaps your database is rather small. Try larger databases, they will usually give score of 0.1 and more - which should be aimed for.
Best,
Christoph
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