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The phrase "are substantial only" is correct and usable in written English.
It can be used to emphasize that something is significant or considerable in a specific context, often followed by a condition or limitation.
Example: "The benefits of this approach are substantial only when implemented consistently across all departments."
Alternatives: "are significant only" or "are considerable only".
Exact(1)
However, the differences between member states are substantial: only 1.8% of the sample in the Netherlands had inadequate health literacy, compared to 26.9% in Bulgaria (figure 1).
Similar(59)
The effects of microtube diameters on the stability limits were substantial only for the methane air microflames of lower mixture temperature.
But the sequestration potential is substantial only in the long term.
However, agreement varied by sinus and, after correction for chance agreement, was substantial only for the maxillary sinuses (kappa = 0.72-0.87).
In the third case, OPA is obviously better than EPA in general, but this behavior is substantial only in the low SNR region.
Figure 3 also shows that in most countries, gender differences among individuals living alone are negligible or even reversed; the gender gap is substantial only in a handful of countries (Portugal, Denmark, Sweden, and Switzerland) and reaches 20 percentage points only in Denmark and Portugal.
The first has been demonstrated to account for most of intestinal water-soluble nutrient absorption in several non flying mammal species [9] [11] while the second has been found to be substantial only in birds [12] [16].
This was substantial only for home ETS exposure.
The second movement is substantial only for monomer 2 of TmPurS, which interacts with TmPurQ.
However, the impact of the population size was substantial only when it was below ~1000; after that the effect reaches saturation, i. e. populations of 1000 or more organisms all evolve in approximately the same way (Fig. 4).
Constant selection can accelerate evolution when it favors more mutable alleles [ 1], but the magnitude of this effect is substantial only when a number of conditions are met [ 2].
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com