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.SYM
The current letter.H
The high price for this letter.L
The low price for this letter.VOL
The volume for this letter. D
The difference between the volume traded at the best bid and the volume traded at the best offer aggregated for this letter.B/A
Displays the volume traded at the best bid and offer aggregated for this letter.RNG
The price range for this letter.