I apologize for possibly being too terse, but the small amount of details you provided only permits a very limited response
Names Default To Here( 1 );
// Open the excel file
dt = Open( "KY.xlsx" );
// Analyze the data
Could you please provide what you are doing to analyze the data? Or are you expecting the JMP Community to help you with what the data analysis should be?
If you remove your Graph Builder code, and add this code into your script, you will get your colors.
dt=current data table();
dt<<new column("Colors", ordinal,formula(If(:crack<=.003,1,2)));
dt << Graph Builder(
Size( 534, 464 ),
Show Control Panel( 0 ),
Variables( X( :Month ), Y( :Crack ), Color( :Colors ) ),
Elements( Points( X, Y, Legend( 3 ) ) ),
SendToReport(
Dispatch(
{},
"Crack",
ScaleBox,
{Min( 0.001 ), Add Ref Line( 0.003, "Dashed", "Dark Red", "", 1 )}
)
)
);