Fig. 3. The relation between the Cerebral State Index (CSI,  A ); Bispectral Index (BIS,  B ); and A-Line ARX Index version 1.6, scaled to 60 (AAI⁶⁰,  C ), and burst suppression, measured as the burst suppression percentage (BS%) for the CSI and AAI⁶⁰and as the suppression ratio (SR) for the BIS.