I am doing a 3D plot with Plot3D

```
using PyPlot
< code that computes x1, x2, x3 >
plot3D(x1,x2,x3)
xlim(6378237-1000,6378237+1000)
ylim(-1000,1000)
zlim(0,1000)
```

Instead of setting the limits of the x-axis with xlim() I would like to set the origin of the x-axis to be 6378237. Which Julia PyPlot command does this?

(It is surprisingly difficult to find the answer on the web)