The phrase "a gap of about" is correct and usable in written English.
It can be used when discussing an approximate distance, time, or difference between two points or values.
Example: "There is a gap of about five years between the two studies, which may affect the results."
Alternatives: "an approximate gap of" or "a difference of around".
(John McCain, by comparison, faced a gap of about five points in 2008).
Both the non-partisan Congressional Budget Office and economists on Wall Street expected a gap of about $370 billion.
"We still think there is a gap of about 25% between the WLTC test and typical average new car driving".
There was a "gap" of about 1.5 gigatonnes (a gigatonne is a billion tonnes) between the emissions-curbing target in the US INDC, and the actions the country was taking, said Höhne.
It took five years, from 1975 to 1980, with enormous sacrifices on the part of all New Yorkers, with the strong support of the city's labor unions and the banks, to close a gap of about $1.5 billion on a city budget of $15 billion.
Toyota's worldwide output was up 10% to 9.02 million vehicles in 2006, while GM produced 9.18 million vehicles from factories around the world, maintaining a gap of about 162,000.
As per his calculations, the project cost had risen to Rs. 12,857 crore ($2.86 billion) of which all the equity, debt and government funding could not meet a gap of about 15%.
About 9,000 units already exist, leaving a gap of about 14,000.
Instead, in 24 trials (ASc) movement onset occurred within 200 ms after SAS, followed by a gap of about 200 ms, and in the remaining 41 trials (ASl) movement onset was again evenly distributed beyond that time point.
A gap of about US$700 million is still required to provide humanitarian assistance until the end of 2014, to 2.9 million people who are struggling to feed themselves.
I find it best to leave a gap of about 5cm up and 10 cm across between the two corners when folding the headscarf.
