Fig. 4From: Plasma levels of a methadone constant rate infusion and their corresponding effects on thermal and mechanical nociceptive thresholds in dogsthermal excursion (%TE) in % of group M over time with corresponding methadone plasma levels in ng ml− 1, both as mean ± SD; BL: baseline; dotted arrow: stop of CRI; * significant (p < 0.05) difference to BL in group MBack to article page