A320 series:
no go red: .81 and more
yellow: .80
green: .79
gold: .78-77-76
green: .75-74
yellow: 73-70
red no go: .69 or less
The gold range and the (s)lower color range would be .1 maybe .2 different among 321-320-319 and possibly the NEO versions. The colour coding is tailored per your explanation to show viability for ATC purpouses.
Hope it helps, you're welcome to to ask further