Fire table for all compound zones by Walt Mulder. This lets you quickly determine if you can fire at a zone, what the distance is, and how what your "die rolls to hit" numbers are.
I don't understand the d6 column. Those zones are all range four: 3 real zones plus the '+1 to range' for shoot over a zone then over a wall. So they should be out of range altogether.
Did you think it was +1 to die roll? Or am I missing something?