Is this the kind of plot you are after?
![Screenshot 2020-12-11 at 10.04.56.png Screenshot 2020-12-11 at 10.04.56.png](https://community.jmp.com/t5/image/serverpage/image-id/28850i9106BF7C3E69E49C/image-size/medium?v=v2&px=400)
If so, for the Variability Chart you will need to use a graphics script. You can make the plot above by running this script:
Names Default To Here(1);
dt = Open("$SAMPLE_DATA/Big Class.jmp");
dt << Variability Chart(
Y( :height ),
X( :sex ),
Std Dev Chart( 0 ),
SendToReport(
Dispatch(
{"Variability Chart for height"},
"Variability Chart",
FrameBox,
{Add Graphics Script(
2,
Description( "" ),
Pen Color( "Red" );
// Females
H Line( 0, 1, 55 );
H Line( 0, 1, 65 );
// Males
H Line( 1, 2, 52 );
H Line( 1, 2, 67 );
)}
)
)
);
To add horizontal lines by hand, do a right click on the white area of the graph and select 'Customize...'. Then hit the '+' sign to add them using 'HLine()' with the values you need:
![Screenshot 2020-12-11 at 10.40.51.png Screenshot 2020-12-11 at 10.40.51.png](https://community.jmp.com/t5/image/serverpage/image-id/28851i6F6ABBBAAEFCC309/image-size/medium?v=v2&px=400)
You can add such lines as part of a bigger JSL script, and if you need to do this often you may want to look into this.