The phrase "a range of approx" is correct and usable in written English.
It can be used when you want to indicate an approximate range of values or measurements.
Example: "The project will require a range of approx 10 to 15 hours to complete."
Alternatives: "an approximate range of" or "a range of approximately".
Two of them developed on granitic Lateglacial moraines (14.9 ka and 10.7 ka, respectively) and three were sampled on lobes of a morphostratigraphically connected relict rock glacier, covering an age range of approx. 10.7 ka to 8.6 ka.
Overall, the distribution coefficients (log Kd) of model HOCs were in the range of approx. 2.0 5.7.
Considering partial time periods, the grouping procedure only took 5 ms, which in this case is caused by the linear time complexity O(N p ). Instead, most of the processing time is consumed by comparing products within the eight groups, which are in range of approx. 2500 to 2700 ms (cf. Table 2).
This is consistent with root/shoot biomass ratios (average approx. 20%) at a range of sites and stand ages in NZ and overseas (Watson and Tombleson 2002; Beets et al. 2007).
The final specific activity of approx. 22 units·mg−1 compares favourably with values reported for homogeneous PEPCs from a range of plant sources [ 1, 13, 26].
Determined to change her livelihood, she asked her father for a one million kw (approx £130) loan to set up a small thatched 'village' shop, on the kerb just outside her house, selling a range of convenience products.
The quality factor of the cavity showed no power dependence within a wide range of powers from approx. −50 dBm to −160 dBm (∼109-10−2 photons in the cavity).
The total number of dye-labelled cells was quite variable in both control and APP mice, ranging from a low of approx. ten, up to several thousand coupled cells, with no statistically significant differences in the number of dye-labelled cells in control and APP mice for any of the three brain regions.
The yaw motion between bogie and car body remains in a very small range of angular motion ((approx 10^{-3} rad)), Fig. 7.
Radial gradients occurred in all species, ranging from an increase of (approx. 70%) in the shade-intolerant Melia azedarach to a decrease of approx. 13% in the shade-tolerant Neolitsea obtusifolia, but the slopes of radial gradients were generally unrelated to shade-tolerance.
