The letter summary shows values and calculations for the current letter. The current letter is whichever last traded. However if the crosshairs are enabled on the chart, the current letter tracks whatever letter is under the mouse as it is moved over the profile.
SYMThe current letter.
HThe high price for this letter.
LThe low price for this letter.
VOLThe volume for this letter.
DThe difference between the volume traded at the best bid and the volume traded at the best offer aggregated for this letter.
B/ADisplays the volume traded at the best bid and offer aggregated for this letter.
RNGThe price range for this letter.