The following graph shows dependance of the arterial pressure on the LVAD
rate. For each heart beat, 3 points are plotted: (+) denoting minimal, (x)
maximal and (o) mean pressure. The 3 points for each beat are
plotted in the column corresponding to the LVAD rate.
The ellipses are centered
at the mean value of a set of points for a constant LVAD rate, and have the
hight (greated diameter) of four standard deviations for the set of points.
So, for each of eight different LVAD rates, 3 ellipses encircle points of peak,
minimal and mean pressure.