Figure 2.

Measured hypocapnic, normocapnic, and hypercapnic quantitative CBF values in relation to the absolute measured PaCO₂ (pco2) in mm Hg. The red values are cortical values taken from Ramsay et al. (1993) or measurements from Kety and Schmidt (1946, 1948), based on the nitrous oxide method. The blue values are white matter flow taken from Ramsay et al. (1993). The points are super-positioned with curves of the expected CBF values when using the correction function relative to a mean normocapnic flow.