The phrase "a relatively narrow area" is correct and usable in written English.
It can be used to describe a specific, limited scope or range within a broader context.
Example: "The research focused on a relatively narrow area of study, specifically the effects of climate change on coastal ecosystems."
Alternatives: "a somewhat limited scope" or "a fairly restricted domain."
Highest metal accumulation was found in a relatively narrow area near the water inflow zone, from which concentrations markedly decreased with increasing distance.
However, the seepage pressure propagated within a relatively narrow area: a slope distance of ∼4 m from the seepage point in the downslope direction due to the damping of seepage pressure.
That legal interpretation is significant, several outside legal experts said, because it uses a relatively narrow area of the law — used to justify airport screenings, for instance, or drunken-driving checkpoints — and applies it much more broadly, in secret, to the wholesale collection of communications in pursuit of terrorism suspects.
In its narrowest sense, "value theory" is used for a relatively narrow area of normative ethical theory particularly, but not exclusively, of concern to consequentialists.
Transformation of descriptive condition-specific measures to a generic preference-based measure would typically require mapping from a detailed description of a relatively narrow area of HRQoL space to a general description of the entire HRQoL domain.
Transformation of the NIHSS scale to the AQoL requires mapping from a detailed description of a relatively narrow area of HRQoL space to a much more general description covering multiple dimensions of HRQoL.
At the same time the distributions of the motifs 2 and 5 still have a relatively narrow region of overrepresentation covering the basal machinery area.
In view of the increased awareness of autism worldwide and the interest from a wide range of stakeholders, research in this relatively narrow area may become a vehicle for broader improvements in evidence, and consequently in practice standards, in child mental health in general.
To overcome this problem, we consider the GATA-3 binding sites as more likely to be located in the relatively narrow area of a promoter region.
One Congressional aide noted today that while Dr. Zerhouni had an excellent record as an administrator, his scientific research had been confined to the relatively narrow area of radiology.
