I could be wrong, but this is confusing, but this is what I understand:

Red line is the bad guys' energy, we want it as flat as possible
Green line is evil/satanic energy
Yellow line is the good guys' engergy
White line is the spiritual/angelic/good energy

So when you see yellow and white active and high it is good(?). When you see the red line flat or low, good (?).

Maybe someone can elaborate on this, but no one really replies to help people understand so I thought I would try...