New chart type proposed (unless it exists) to show blood pressure with
highlighted difference for ISH (see e.g.
http://www.medicinenet.com/high_bloo...sure/page3.htm) or
http://www.nhlbi.nih.gov/hbp/hbp/whathbp.htm
3 series values: (1) systolic, (2) diastolic, and (3) pulse pressure (=
systolic minus diastolic)
For series 1 and 2, use current line graph
Series 3, difference would be highlighted by a vertical line (with label)
connecting Series 1 and 2 plot points for each reading

This type of chart might have other uses (generalize BP terminology S, D, PP
to high, low, difference).


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