Illustration of censorship in likelihood for Gaussian additive random deteriorations. The first four panels show four values of M_ℓ(θ⁽ⁱ⁾), i = 0, . . ., 3 and the associated Gaussian additive PDF. The censored portion, below the censorship threshold ω, is highlighted. The fifth panel shows the likelihood function taking censorship into account, that is, the Gaussian CDF Φ. The sixth panel shows the corresponding negative log-likelihood.