You can get what you want by using the Customize capability in JMP.
If you generate a histogram using Graph Builder, specifying not to draw the Fences, one can then use the Customize to add back in the Fences you want.
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Right click on the graph and select Customize. Then click on the + to add a script, and copy in the simple script commands into the Customize window, and press Apply. It will add in the 2 fences you want.
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Jim