I wish to center the 1 in the following LaTeX code:

```
\begin{align*}
v'(k,\CS)=
\begin{cases}
    \displaystyle\frac{G_{max}(k){-}q_k'(CS)}{G_{max}(k){-}\Gmin(k)} & \text{if }G_{max}(k) {\neq} G_{min}(k) \\
    1                                                                &  \text{if }G_{max}(k) {=}G_{min}(k)
\end{cases}
\end{align*}

```

The image of the LaTeX is shown below:

> 
> ![enter image description here](https://i.stack.imgur.com/c920B.png)
> 
> 
>