\usepackage{tikz}
\definecolor{monOrange}{rgb}{0.97,0.35,0.04}
\newcommand*\commentterm[4][]{%
\begin{tikzpicture}[anchor=base west,%
baseline,%
inner sep=0pt,%
outer sep=0pt,%
minimum size=0pt]%
\node(xa){$#3$};
\node[overlay,at=(xa),shift=(#2)](xb){#4};
\draw[overlay,->,shorten <=2pt,shorten >=2pt,#1](xb)to(xa);
\end{tikzpicture}%
}
$z=2^{\commentterm[color=blue]{\n:2cm}{\color{red}n}{\color{monOrange} \n:2cm}}$
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