Auto Index - automatically output all indices within the array..
Index - manually output an index within the array (uncheck Auto Index to enable).
Add - use this button to add more rows (indices) to the array.
0: Shader - the first index in the array.
Create an Ellipse.
Select the Ellipse.
alt/ option + click
the Duplicator icon in the Shelf.
Create 3 Gradient Shaders.
Create a Shader Array.
Use the + Add
button to create 2 more indexes on the Shader Array.
Connect your Gradient Shaders to each Shader Array index.
Connect your Shader Array to the Shaders attribute on your Shape (under the Fill tab).