Figure 2From: Differences in tidal breathing between infants with chronic lung diseases and healthy controlsTypical shapes of tidal-breathing flow volume loops in newborns. To reduce the breath-to-breath variability a zeroing of volume at the begin of each inspiration was performed. In accordance with the common presentation of flow-volume loops, the inspiration started on the right side and continues in the lower quadrant, whereas the expiration follows in the upper quadrant.Back to article page