Range a = new Range();
a.setFrom( 8 );
m3.setX( a );
m3.setColor( "#000000" );
Markings ms = new Markings();
ms.addMarking( m );
ms.addMarking( m2 );
ms.addMarking( m3 );
// End of Marking Code
// Add Markings Objects to Grid Options
plotOptions.setGridOptions( new GridOptions().setHoverable( true ).setMarkings( ms ) );