There is the following sentence in the Chicago Manual of Style:
When compound modifiers (also called phrasal adjectives) such as open-mouthed or full-length precede a noun, hyphenation usually lends clarity. … When such compounds follow the noun they modify, hyphenation is usually unnecessary, even for adjectival compounds that are hyphenated in Webster’s (such as well-read or ill-humored).
There is also the following one:
If the phrasal adjective follows a verb, it is usually unhyphenated—for example, compare a well-trained athlete with an athlete who is well trained.
My question is: Does it apply to fine-grained? For instance, is the following correct?
Such information is called fine grained, as it contains multiple measurements.
Or should it be instead as follows?
Such information is called fine-grained, as it contains multiple measurements.
I suspect that fine-grained doesn’t qualify as a phrasal adjective.