The phrase "are only detected" is correct and usable in written English.
It can be used when discussing the conditions or limitations under which something can be identified or observed.
Example: "These signals are only detected under specific environmental conditions."
Alternatives: "can only be identified" or "are solely observed".
Heavy neutral nitrogen compounds, such as carbazole and its alkyl homologues, are only detected with traces of quinoline.
Followup for a year is essential as a significant proportion of cases are initially negative and are only detected at a later stage by either detection of blood parasites or by seroconversion.
Importantly, the 'window' for clinical detection of an invasive PC is shorter since these lesions are only detected once they reach a certain size.
Raman Scattering shows that copper sulfoselenides Cu–(Se,S) are only detected in Cu-rich samples.
Finally, the PPR anomalies are only detected in the westward direction 1800 s after the onset of the eruption.
"But that these are only detected incidents - often by hill-walkers and members of the public - and only of poisoning.
Conclusions: GERD is associated with microscopic alterations in the palatal mucosa (epithelial atrophy and increased fibroblast number), which are only detected by morphometry.
Such species are only detected when TiO2 is exposed to toluene oxygen mixtures enriched in the organic, and under these conditions neither of the other oxygenated radicals is formed.
Lastly, the fourth point of the abscissa axis reflects the situation when RS23, RS31, and RS15 are malicious and a compensation procedure is processed for RS15 while the intrusions of RS23 and RS31 are only detected.
A previous study reported the detection of phenolic compounds, such as 4-vinyl alcohol, vanillin and vanillic acid are only detected in the distilled awamori shochu or its aging (Koseki et al. 1996).
