An expression which evaluates to a list of gradient stops.
Example
// List to hold gradient stopsvariable tRampputtheempty list into tRamp// Set up gradient stopspush gradient stopat0withcolor [1,0,0] onto tRamppush gradient stopat0.5withcolor [0,1,0,0.5] onto tRamppush gradient stopat1withcolor [0,0,1] onto tRamp// Create new gradient paintvariable tGradientput linear gradient with ramp tRamp into tGradient