In JMP 13, in Graph Builder I dragged X1, X2 and X3 to the x axis, one at a time. When I dragged X2 I dropped it into the zone at the lower right, not the center. Same for X3. This is my result:
Here's the corresponding JSL:
New Table( "Test", Add Rows( 4 ),
New Script("Percent Reacted vs. X1 & 2 more",
Graph Builder(Size( 486, 452 ),
Show Control Panel( 0 ),
Variables( X( :X1 ), X( :X2 ), X( :X3 ), Y( :Percent Reacted ) ),
Elements( Position( 1, 1 ),
Line( X, Y, Legend( 40 ) ),
Points( X, Y, Legend( 43 ) ) ),
Elements( Position( 2, 1 ),
Line( X, Y, Legend( 41 ) ),
Points( X, Y, Legend( 44 ) ) ),
Elements( Position( 3, 1 ),
Line( X, Y, Legend( 42 ) ),
Points( X, Y, Legend( 45 ) ) )
)
),
New Column( "X1", Numeric, "Continuous", Format( "Best", 12 ),
Set Values( [1, 2, 3, 4] )),
New Column( "X2", Numeric, "Continuous", Format( "Best", 12 ),
Set Values( [44, 33, 22, 11] )),
New Column( "X3", Numeric, "Continuous", Format( "Best", 12 ),
Set Values( [444, 333, 555, 666] )),
New Column( "Percent Reacted", Numeric, "Continuous", Format( "Best", 12 ),
Set Values( [10, 20, 30, 20] ))
);