"a fraction below" is correct and can be used in written English.
You can use this phrase to indicate a number or quantity that is slightly less than another number or quantity. For example, "I need to finish this project before the end of the month, so I'm working a fraction below my usual capacity."
Attendance of nearly 12 million, up 3percentt from that of 2003, was just a fraction below the record, just over 12 million in 2002.
But Canaccord Genuity was more positive: Mitchells & Butlers reported prelims a fraction below our expectations but there's a fragile but improving trend developing.
If I was betting, then I'd put money on Furious 7 finishing a fraction above Avengers 1, and Ultron a fraction below.
The fee for the 26-year-old, who has signed a three-year contract, falls a fraction below the £6m the south London club paid to Peterborough for Dwight Gayle last summer.
Last year, the number of households in England in private rented accommodation rose to 4.4 million, a fraction below the 4.5 million high at the start of the 1960s.
The TV series lovingly re-creates that vanished Pan Am, of wholesome, curvy girls in their trim, blue twill suits cut a fraction below the knee, with spotless white gloves and matching handbags.
Suppose you stick to a five-times-a-week gym regimen, as I do, and have put in a lifetime of hard cardio exercise, and have a resting heart rate that's a significant fraction below the norm.
It is concluded that for alloys with a solid fraction below approximately 20%, the internal structure of the primary solid and the eutectic mixture control the properties.
In selected conditions the reduction results in Ni nanoparticles of various dimension scales, finely dispersed at the pore surfaces, with a significant fraction below 50 nm, as confirmed by TEM/EDS.
Like its much larger sibling at Cern, the circular particle accelerator at Argonne shoots electrons around its 0.7-mile (1.1-km) circumference at a tiny fraction below the speed of light.
The differences in CD34+ cell recovery cannot be explained by differences in cell apoptosis/necrosis, since only a small fraction (below 10%) of the cells are affected by those (Fig. 6A).
