Hi,
I am novice user of JMP. When creating a graph, I know I can add a horizontal line using this method:
- Right-click in one of the plots and select Customize.
- Click Add (plus sign).
- Type H Line( Y ), where the Y argument is the value for the reference line.
- Click OK.
But what is the script for choosing thickness and how do I change the color of that line.
Right now, I have thin black line:

Many thanks