The phrase "able to trace only" is correct and usable in written English.
It can be used when indicating a limitation in the ability to trace something, suggesting that only a specific aspect or part can be traced.
Example: "The detective was able to trace only the last known whereabouts of the suspect."
Alternatives: "capable of tracing solely" or "limited to tracing just".
Lunar geologists have been able to trace only some of its adventures since it finished crystallizing out of molten magna back at the Moon's beginning.
But so far, police investigators have been able to trace only a single $1,600 shipment of equipment, delivered to a nonexistent business in Brooklyn.
While they contend, for instance, that the plot cost nearly $500,000, they have been able to trace only half of it back to a suspected Al Qaeda source.
And while the Behar group identified four major mtDNA "founder groups" for the Ashkenazim, all supposedly with roots in the Middle East, it was able to trace only about 40% of Ashkenazi ancestry overall.
The team was also able to trace the reaction not only in time, but also as a function of the frequency of the reflected light.
A system of citizenship derived from racist principles means a person must be able to trace their bloodline -- only on the father's side -- to people who were living in Qatar when the British gave the area to the Al-Thani family prior to "independence" in 1971.
It should be noted here that the other traceback methods in the face of such a situation are only able to trace up to the edge router and therefore, they would cut off the access of all nodes forwarded by the edge router. .
We did have weaknesses in that we were only able to trace deaths in the decades from 1988 onwards, however, we would in any case have lagged exposure by 10 20 years to account for the latent period of cancer, thus excluding earlier deaths.
However, the researchers added, they believe the F.B.I. has seized only about 22 percent of the commissions they have identified, and that they themselves have only been able to trace about a third of the total.
After defeating the incumbent king, Richard III, at the Battle of Bosworth, Henry went to work legitimising his claim to the throne, despite only being able to trace his lineage to a chamber servant.
Because slavery meant that their black ancestors were considered property and not people, most African-Americans are able to trace their roots in this country only back to the first quarter of the 19th century.
