Figure 1. Dose-response analysis of inhaled nitric oxide in patients with (group 2: 12 patients; open bars) and without (group 1: 15 patients; hatched bars) norepinephrine (NE). For the median ratio of oxygen pressure in arterial blood to the fractional concentration of oxygen in inspired gas (25, 50, and 75 percentiles), the largest and smallest values that are not outliers are reported. Outliers (cases with values between 1.5 and 3 box-lengths from the upper or lower edge of the box) are presented as open circles. Extremes (cases with values more than 3 box-lengths from the upper or lower edge of the box) are represented by a cross.