Each animal is represented by a different symbol outline, with fill color or pattern of a given symbol defining a different region in a given animal. In arcade vessels, multiple measurements for each vessel are grouped and averaged, such that each region is represented by 1 arcade arteriole PO2 and 1 arcade venule PO2 symbol. In venular tree structure, each symbol is an average over 4 sequences. Direction of blood flow is from left to right. Error bars and point connection lines have been removed for clarity.
Lines are least squares regression lines for different subtraction groups.