I am using Lyx as my front end but I dont think this make any difference. Testing following code
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\documentclass[oneside,british,oldfontcommands]{memoir}\usepackage{babel}\OnehalfSpacing\makeatletter%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.\sisetup{per-mode=fraction, tight-spacing = true , fraction-function = \tfrac , quotient-mode = fraction}%\sisetup{inter-unit-product = \ensuremath { { } \cdot { } } , exponent-product = \cdot }%\sisetup{input-product=x , output-quotient = \ensuremath { { } \times{}}} %for 1x2x3\sisetup{group-minimum-digits = 4} %start grouping from 4 digits, in 3 no groups\sisetup{range-units = single} %2-3C not 2C-3C\sisetup{separate-uncertainty=true} %2+-1 not 2(1)%\sisetup{scientific-notation = engineering } % exp in multiple of 3\sisetup{prefixes-as-symbols=false} %10^-9 ect ect%\sisetup{zero-decimal-to-integer, round-mode = places,round-precision = 3}%\DeclareSIUnit[scientific-notation = engineering, prefixes-as-symbols=false]% {\second}{s}\DeclareSIUnit[scientific-notation = engineering, prefixes-as-symbols=false]{\ns}{\nano\second}\makeatother\begin{document}\begin{center}Where short term stability is $\SI{10(1)}{\nano\second}$ as well as $\SI{10(1)}{\ns}$, but our network edge is $\SI{10}{\km}$.\par\end{center}\end{document}