- The solution found corresponds to:

- dt=LS

- dt =observed - theoretical time

- L=matrix of path length elements

- S=block slowness matrx

- S(k+1) =S(k) +W-1LT [LW-1 LT + eE-1]-1 (dt)

- W is block weight

- E is travel time uncertainty

- An iterative solution is found by approximating the inverses with the inverse of their diagonals.

- Where

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