Hi,

A question about Plots.jl. The “contour” plot below (actually representing a scalar field by colors), works as it says on the packaging.

```
using Plots;gr(size=(2000,1000))
x = y = linspace(0,1,51)
p2 = plot(x,y,(x,y)->(x*y/2.),st = :contourf,fill=(true,cgrad(:grays,[0.,0.1,1.0])))
```

But I would like to do is have control of the range using in encoding “z” (the anonymous function) with colora. In my usage, the “bgrad” takes the min and max values of z to scale the colors.

Feedback on Plots.jl: excellent work, *thank you!*. The limiting factor now is the quality of the documentation…