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Semiquantitative estimation of the amount of floating intra-alveolar complexes: (A) complexes are absent (0 points), (B) single complexes (1 point), (C) less than half of the visual field is covered (2 points), (D) half of the visual field is covered (3 points), (E) more than half of the visual field is covered (4 points), (F) the visual field is completely covered (5 points).
