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CylindricalGravity

-              v12
+              v13
 Offsets (:,0) = 0 is the starting line in the routine. It states that in any dimension, the center cell itself has a '0 offset'.
+When all is said and done, the array's values are given as:
+'''Offsets (i,m) ='''
+|| '''i\m''' || 0 || 1 || 2 || 3 || 4 ||
+|| 1 || 0|| -1 || 1 || 0 || 0 ||
+|| 2 || 0|| 0|| 0 || -1 || 1 ||
+-1 corresponds to left/down, and +1 to right/up. So this states the 1st cell in the stencil (m=1) has a position to the left of the center cell in the i=1 (x) direction, and the 2nd cell is to the right. The 3rd and 4th cell has a 0 offset in x (because they are above and below the center cell). This is why their offsets are listed in the 2nd row of the table. Again, the center cell itself (m=0) has 0 offsets from itself in both directions.