The phrase "at either extreme" is correct and usable in written English.
It can be used to refer to two opposite ends of a spectrum or range.
Example: "The opinions on this issue vary greatly, with some people at either extreme of the debate."
Alternatives: "at both ends" or "on both sides".
Wonjung Kim, the soprano, sounds comfortable at either extreme.
He has turned out a hearty offspring, challenging time at either extreme.
Of course, this metric overstates inequality by focusing on countries at either extreme.
Dynamics are often exaggerated at either extreme in typically wide-ranging sound from Telarc.
"To be really healthy," Ms. Herman said, "you don't want to be at either extreme.
Question Time Pirate Ship Laugh and clap as political debate swings harmlessly from left to right, prompting whoops of giddy thrill at either extreme.
Therefore, LQAS performs well (errors are equal or below the expected) when classifying lots with coverage that is at either extremes, as shown by the operating characteristic (OC) curve, which plots the binomial cumulative distribution as an exact function of coverage (Fig. 1).
Paralleling movement patterns, body temperature cycles between water temperature (here 22 26°C) and operative temperatures during basking (here 40 45°C) without reaching either extreme, except at night in the absence of the radiant heat source when animals cool to water temperature (Fig. 4a).
Either extreme resulted in relatively large sizes-at-settlement, an advantage for juvenile survivorship.
So, one cheer for the sudden interest in top pay, but the next thought is: "Why just now?" The answer is not to be found at either financial extreme, but bang in the economic centre, where elections are won and lost.
Astronomers have studied many black holes at either size extreme — "stellar-mass" black holes, which are a few dozen times as weighty as the sun, and supermassive black holes, which can contain millions or billions of times the mass of the sun and lurk at the heart of most, if not all, galaxies.
