It appears that prior to JMP 16, the Show Limits option is not honored by the Fit Curve platform. However, in JMP 16 it is
You will have to add the reference lines programmatically until you upgrade to JMP 16.
Names Default To Here( 1 );
dt = Open( "$sample_data/semiconductor capability.jmp" );
fc = Fit Curve(
Y( :NPN1 ),
X( :PNP1 ),
SendToReport(
Dispatch(
{"Plot"},
"5",
ScaleBox,
{Min( 103.62 ), Max( 128 ), Inc( 5 ), Minor Ticks( 1 )}
)
)
);
spec = :NPN1 << get property( "spec limits" );
fcr = fc << report;
fcr[axisbox( 1 )] << add ref line( spec["LSL"], solid, blue, "LSL" );
fcr[axisbox( 1 )] << add ref line( spec["Target"], solid, blue, "Target" );
fcr[axisbox( 1 )] << add ref line( spec["USL"], solid, blue, "USL" );
Jim