How to create a RGB gradient?

Question

I would like to know how to create a perfect RGB gradient in Illustrator like this:

enter image description here

Edit: I tried to use the gradient tool, but how to place the colors correct?

2015/02/01

p2or · Accepted Answer · 2/1/2015 9:12:00 PM

The shown gradient consists of 5 full colors.

Use the gradient tool and setup the colors with an offset of 20% like this:

enter image description here

p2or

2015/02/01