Examples of (a) and (b) lung resistance (R_L); (c) and (d) lung elastance (E_L); and (e) and (f) anatomic dead space (V_D) during targeted and continuous delivery for two representative dogs. Data are shown for a positive responder (left panels) and a nonresponder (right panels) during targeted and continuous sevoflurane delivery. Symbols denote the mean value from 20 breaths. Errors bars, when larger than the symbol, denote standard deviations.