Preferably, when the procedure reaches this step for the first time, all the probabilities in all cells are set to 0. For each measurement level Σ∈{1, 2, . . . , L} and for each processing m∈{1, 2, . . . , M} the probability p{Σ, m} is assigned a new value that is:

greater or equal to p[Σ, m] if σ ∈ Σ

smaller or equal to p[Σ, m] if σ∉ Σ

greater or equal to p[Σ, m] if σ ∈ Σ

smaller or equal to p[Σ, m] if σ∉ Σ