The phrase "a variation of about" is not standard in written English and may cause confusion.
It could be used when discussing a range or difference in measurements or values, but it is better to clarify the context.
Example: "The temperature showed a variation of about 5 degrees from the previous day."
Alternatives: "an approximate variation of" or "a difference of around".
From the field investigations results, it was observed that the intensity of abutment loading was negligible with a variation of about 0.6 kg/cm2 stress over the pillars/stooks within 15 m in advance of the line of extraction.
However, for Plinian and sub-Plinian eruptions at Vesuvius, for the target area, this empirical parameter (Costa et al. 2013) typically varies between 3000 and 5000 m2/s (e.g. Macedonio et al. 1988, Macedonio et al. 2008), resulting in a variation of about 6%% of the hazard area.
A variation of about ±12,300 m3, due to uncertainty in DEMs from aerial photographs, was calculated.
For the considered reference scenario (column height 18 km), this leads to a variation of about 15%% in the extension of the hazard zone between Summer and Winter.
A variation of about 10% in any of the soil physical textures resulted in a change in dry yield of 0.4 t ha−1.
The result showed that the dielectric constant was fairly uniform over the sample area with a variation of about 2% and that the average dielectric constants of the films were 4.26 and 4.01 for N2/O2 flow ratios of 0.01 and 1, respectively.
The value of P/πc2, where P is the load and c the radius of the surrounding dislocation zone, is however fairly constant with respect to load, with a variation of only about 10% in the same load range.
The median RCV of Rasmussen et al's participants was 2518 mL, so the uncertainty of ±240 mL equates to a variation of ±9.5% about the median RCV.
Earlier inversion results suggested a bulk density variation of about 250 kg m−3 (Schill et al. [2010]).
These errors represented a coefficient of variation of about 11% for both measurements.
This, together with a proportion of sporadic variation of about 0.5%, reflects a high degree of exchange activity.
