How to set Scale Values in Graph Builder use Col Quantile function?

[#1]

HI, I want  set Scale Values in Graph Builder use Col Quantile function,  but always something wrong. 

the red code have some problem. I need color scale as Quantile

Graph Builder(
	Size( 839, 726 ),
	Variables( X( :Prober_X ), Y( :Prober_Y ), Color( :OpticalPower ) ),
	Elements( Points( X, Y, Legend( 6 ) ) ),
	SendToReport(
		Dispatch(
			{},
			"400",
			ScaleBox,
			{Legend Model(
				6,
				Properties(
					0,
					{gradient(
						{Color Theme( "Spectral" ), Scale Values( [Col Quantile( :OpticalPower, 0.9 )], [0.175] ),
						Label Format( "Fixed Dec", 15, 3 )}
					)},
					Item ID( "OpticalPower_0p23A", 1 )
				)
			)}
		)
	)
)