Thanks
I'm going to assume you're doing an anova. But I was able to fake it by putting a 0 line width reference line at the spot where I wanted it, then you can do whatever you want to the font.
Names default to here( 1 ); dt = open("$SAMPLE_DATA\Big Class.jmp"); dt << Oneway( Y( :height ), X( :age ), SendToReport( Dispatch( {}, "2", ScaleBox, {Add Ref Line( 21, "Solid", "Black", "14", 0, 1, Label Settings( {Set Font Style( "Bold" )} ) )} ) ) );
I got the number 21 from inside the value labels of the axis.
Thank you!