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The phrase "only observed" is correct and can be used in written English.
It is often used to describe something that has been seen or noticed, but not necessarily studied or analyzed. Here is an example: "The behavior of the new species of bird was only observed for a short period of time before the researchers had to leave the area." In this sentence, "only observed" indicates that the researchers did not have enough time to study the behavior of the bird in depth, but they still had the opportunity to see it and make some basic observations.
Exact(60)
I've not only observed this behavior.
So far I've only observed, but as my course goes on I'll start dealing with patients.
Unlike K-41, the soldier, a driver, said he had only observed the massacre.
"One show only," observed one of the actors, Steve Rosen.
Rhizome branching was only observed at 42% SI.
H2 production was only observed in the absence of H2S.
PCR amplifications were only observed in 10 grouper species.
These effects were only observed in the paired groups.
Brittle deformation and failure are only observed for gypsum.
However, contaminations were only observed using commercial media.
However, this was only observed for certain dwell times.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com