Fig. 1From: Coagulation during elective neurosurgery with hydroxyethyl starch fluid therapy: an observational study with thromboelastometry, fibrinogen and factor XIIIPerioperative ROTEM variables. Black boxes are all patients, whereas the grey box in each graph represents only the patients receiving ≥1 L HES. The reference ranges for the variables are indicated by horizontal lines from the Y-axisBack to article page