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I've been trawling through some of these sites and either i'm stupid (most likely) or it just isn't obvious. I've contacted chugnut to see what advice he can offer.
the relevence is reported back as a decimal number, when ordered in decending order, the first relevance rating is 100%. Multiply this number by 100, then divide the result by each of the following relevances and you'll receive a new decimal. This is a percentage of the first in their relevance.