Grade C lens candidate


https://www.legacysurvey.org//viewer/?ra=340.1736&dec=0.0220&layer=hsc-dr2&zoom=16

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Me ‘nudnik’ = bother…
Please, can you define (explain) A-lens, B-lens, C-lens?

those who study gravitational lens candidates in these legacy sky survey images classify the lens candidates by their quality and degree of certainty that it is actually a gravitational lens. My classification is an attempt to use the same kind of judgment over the probability that it is or is not a gravitational lens. Grade A is almost certainly a lens, and Grade C is less than 50/50, but worth identifying “just in case”.

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Great - Thanks for your time.
You made my day.