# [Tex/LaTex] LaTeX symbol for a particular chi-squared

symbols

In the book An Introduction to Error Analysis: The Study of Uncertainties in Physical Measurements by J. R.Taylor I find the following formula:

In LaTeX, does it exist any symbol for shown above?

% arara: pdflatex
$\tilde{\chi}^2=\frac{1}{d}\sum_{k=1}^{n} \frac{(O_k - E_k)^2}{E_k}$