### 2d plot axes labels

Hello,

How do I add labels (names) to my axes when doing a simple 2d plot such as:

```
t = var('t')
E(t)=(10.40*(1-exp(-0.25*t)))^2.81
plot(E,t,(x,0,15))
```

I would like to do so the labels are aligned directly under the x axis and ~~vertical ~~vertically over the y axis. Is there a way?