You take the distance between the 2 boxes, and cut that in half. That is the diameter of the sphere that is at the midpoint between the two boxes. The shape isn't really a sphere, it's more like an American football shape, but this gives you an idea of how far up, down, towards the foot and head of the bed the field goes.
For more details, please check the link:
https://www.facebook.com/groups/spooky2/posts/3394847660677113
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