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Schematic presentation of the experimental design used. At four positions (Pos. 1 to Pos. 4) along the inspiratory limb of the respiratory tubing, NO and NO2 concentrations were measured by means of chemiluminescence (CLD 700 AL chemiluminometer). The upper part of the figure demonstrates the measurement design without a humidification system. In the lower part the site of the active humidification system is indicated between Pos. 1 and Pos. 2.
