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Fig. 5. —Graph shows alternative free-response receiver operating characteristic curves for all six observers on 2K monitor overview without postprocessing. We determined ranking for observers according to calculated area under curve values for every monitor condition for which 2K monitor overview is representative example. On average, observer 6 performed best followed by observer 4, observer 5, observer 3, observer 1, and observer 2. Observer 1, a = 0.57, b = 0.96, A_z = 0.6597. Observer 2, a = 0.27, b = 0.28, A_z = 0.6024. Observer 3, a = 0.56, b = 0.56, A_z = 0.6884. Observer 4, a = 1.15, b = 1.03, A_z = 0.7882. Observer 5, a = 0.76, b = 0.55, A_z = 0.7457. Observer 6, a = 1.83, b = 1.18, A_z = 0.8821.