15984778_Astronomy___Astrophysics__A_A__ti_word_verbs_and_expressions__Error_
[The phrase to question] "Metal-poorer" or "More metal-poor"? Both are accepted, but why not the more standard "is richer/poorer in metals" in some cases? [Error?] 
R
x
M
R
x , R
I
Astronomy & Astrophysics (A&A)
Error?