How to display very large fractions nicely

Question

I want to replicate the following fraction:

However, I don't know, how I can get this nice diagonal fraction line. The nicefrac package did not display it like I would like to.

So far I used

\frac{dN}{dS} = \nicefrac{\frac{\sum_{p \in G}i_p^N}{T_G^N}}{\frac{\sum_{p \in G}i_p^S}{T_G^S}}

but that looks like this:

Thanks in advance!

Answer 1

\middle but adjust the space slightly

\documentclass{article}

\usepackage{amsmath}

\begin{document}

\[
\frac{dN}{dS} = \left.\frac{\sum_{p \in G}i_p^N}{T_G^N}
                \!\middle/\,
               \frac{\sum_{p \in G}i_p^S}{T_G^S}\right.
\]
\end{document}