Fig. 1. Bland and Altman test with individual values of cerebral oxygen saturation (Sc^O2) and venous jugular oxygen saturation (Svj^O2).  Open symbols: CO²test, with upper and lower dotted horizontal line corresponding to ± 2 SD. Middle dotted line represents the bias.  Closed symbols: pressure test, with upper and lower solid horizontal line corresponding to ± 2 SD. Middle solid line represents the bias.