\documentclass{article}
\usepackage{arrayjobx}
\newarray\MyData
\readarray{MyData}{ 0.0000000000000000000072 }
\usepackage{siunitx}
\sisetup{output-exponent-marker = E,round-mode = figures, round-precision = 1,
scientific-notation = true}
\begin{document}
\checkMyData(1)
\num{\cachedata}
\end{document}
但它告诉我没有找到。