\documentclass[tikz,border=5pt]{standalone}
\usepackage{amsmath,amssymb,color}
\usepackage{tikz}
\begin{document}
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\draw (509.33,137.07) node [anchor=north west][inner sep=0.75pt] {$\delta _{i}$};
\draw (464.33,80.4) node [anchor=north west][inner sep=0.75pt]
{$\frac{1}{3} \delta _{i}$ };
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{$\frac{1}{3} \delta _{i}$ ~};
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{$\frac{1}{3} \delta _{i}$};
\draw (416,125.4) node [anchor=north west][inner sep=0.75pt]
{$\widetilde{u}_{k}$};
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{$v_{i}{}_{-1}$};
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{$v_{i}$};
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{$T_{i}$};
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{$\mathrm{slope} \ = \ -2^{k}$};
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{$\overline{u}$};
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\end{document}