"clearly stand out" is correct and usable in written English.
You can use it when you want to express that something is very noticeable or distinct. For example, "The tall building clearly stood out among the other buildings in the city skyline."
The valley bottoms clearly stand out because generally they are warmer and drier than the surrounding heights.
The two books in fact that clearly stand out in Michael Brett's beautiful, crisp, clean edition of New Collected Poems are Poems of Dedication (1947), and the much later The Generous Days (1971), the book in which Spender admits to and makes the most of his failings.
The heavy Au atoms clearly stand out on the light background of zeolite BEA.
When applying quantitative requirements for the 28 genes not associated with side effects, a few genes clearly stand out as favorable, depending on the pathogen.
In each fingerprint volume range, there exist a very small number of reference shapes that clearly stand out as being used most often.
Because of the concomitant presence of both white pigments in the original paint layer, some overpaints and/or later paint layers, not visible through infrared reflectography and X-ray radiography imagery methods, clearly stand out through the MA-XRF maps of Zn, Pb and Ba, shown in Fig. 3a, b.
The one name that clearly stood out from the group was Colombia, whose new president, Juan Manuel Santos, has sought to polish the country's human-rights record.
"The thing that clearly stands out if you peruse the Texas shooter's timeline is his third to last tweet," the one promoting Mr. Hussain, said Daveed GartenseniorRoss, a senior fellow who researches extremism at the Foundation for the Defense of Democracies and who shared a PDF of Mr. Simpson's Twitter history.
"There!" one of the scientists suddenly shouts, "stop and rewind!" and indeed, on the event display, a green particle track clearly stands out from all the grey ones.
