
The chart shows the trend of the mean diameter during the examination. The chart is divided into three or two parts, according to the Studio modality. You have basal (1), ischemia (2) and vasodilation (3) in FMD; ischemia is missing in "Vasodilation". In offline mode, a fourth part (4) may be present if the time length of the video is greater than the sum of the basal + (ischemia) + vasodilation.
The time length of the three (two) parts is set in the Time Panel.
Using the buttons at the top right (5) you can move up 
 or down 
 the chart, enlarge 
 or reduce 
 the vertical scale or restore 
 the default view.