On my new layout I basically have 2 main lines that are independently powered. I want to use a #6 Atlas code 83 turnout (green cicle in pic) on the outside main line and run into a crossing ( Red cicle in pic) on the second inside main line allowing me to reach various facilities located inside of second line via the out side track. The tracks are spaced 3" on centers. How do I figure what degree crossing(s) to purchase? Thanks for your help.