'a remarkable variation' is correct and usable in written English.
You can use it when you want to emphasize the unexpected and unique change in something. For example: "The new version of this software includes a remarkable variation in its design compared to the previous version."
Another example from the group, and a remarkable variation on a fantastic theme, is in the Met collection and on permanent view in the Rockefeller Wing.
The results, they said, showed a "remarkable variation in the structure of rocky reef ecosystems," with three distinct groups: reefs with large fish biomass and algae, the healthiest sites; sites with fewer fish, though with an abundance of algae; and reefs with both few fish and "extensive barrens".
There is a remarkable variation in link rates when adopting P2P with Grid and is less when using only P2P.
In Ophiocordyceps sinensis, one of the most valuable medicinal fungi, a remarkable variation of the ITS region has been revealed.
The magnetic model of profile (A−A′) shows a remarkable variation in the thickness of the sedimentary rocks of the study area.
Furthermore, there is a remarkable variation of media data throughput in Admire system, so a speed adaptive encryption scheme is needed.
There was an even more remarkable variation of nearly 300% in resources spent on outpatient diabetes care and diabetes pharmacy costs across these clinics.
In this study, we identify DUs in an even more widespread fish species that occurs across a variable landscape, which displays remarkable variation within and between populations in ecology, life-history evolution and biogeographic history, and which has high taxonomic and phenotypic complexity.
Comparing Figs. 2 and 3a, it is clearly understood that a remarkable spatial variation in attenuation property showed up on the poorly reflective area below the shallowest stratified layers.
Interestingly, previous studies noted that the gudgeons have a remarkable, continuous variation in head shape, exhibiting a short, intermediate, or long head [19] [21].
In addition, they exhibit a remarkable structural variation, particularly in the TIRs.
