Rectangular Gradient

• Create a new file. 
• Select two different color as primary and secondary.
• From tool bar choose Select Tool >> Left Half  
• Now go to CarpeTool >> Create >> Textures >> Gradient
• Set the Gradient Type to 5 colors - 11 Shades 

(Note: Gradient Shades can be set as per needed.)

       

• Go to Mirror Tool >> Border Reflection >> Top Left
• Again choose the Select Tool >> Top Left Quarter
• Now finally select Mirror tool >> All Directions >> All Immediate 

        

• This is how rectangle gradient is created but this is applicable only for visualization purpose, but for graph purpose follow some additional steps.
• Create a new layer and from tool bar choose Select Tool >> Left Half  
• Now go to CarpeTool >> Create >> Textures >> Gradient
• Set the Gradient Type to 5 colors - 11 Shades and select the option Draw Shades for graph.

• Now follow the same steps as done before.