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expr and evalexpr for Graph Builder gradient limits

I am trying to set up a script that will generate a Graph Builder with gradient min and max equal to to Quantile values of the Column being plotted.

 

Unfortunately, the expr and evalexpr syntax I am using doesn't work for the matrix in "Scale Values".

 

I need help.

 

dt0 = current data table();
param = "Voltage";
colp = dt0:param;
graph_high = Quantile( 0.975, column(dt0, param) << get as matrix() );
graph_low = Quantile( 0.025, column(dt0, param) << get as matrix() );

cmd = expr(
 Graph Builder(
  Size( 550, 550 ),
  Show Control Panel( 0 ),
  Variables(
   X( :x ),
   Y( :y ),
   Color( :expr(param) )
  ),
  Elements( Points( X, Y, Legend( 6 ) ) ),
  SendToReport(
   Dispatch(
    {},
    "400",
    ScaleBox,
    {Legend Model(
     6,
     Properties(
      0,
      {gradient( {Scale Values( [expr(graph_low) expr(graph_high)] )} )}, // *Need Help Here*
      Item ID( expr(param), 1 )
     )
    )}
   )
  )
 );
);

eval(evalexpr(cmd));

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