It is very small and often I can't see them. For instance, those tildes:

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

```
\tilde{g}_{ij}\de{\tilde{x}^{i}}{x^{k}}\de{\tilde{x}^{j}}{x^{l}}

```