In Consonant Chart or Vowel Chart view, if you let the mouse pointer rest on a phone in the chart or histogram, or on a histogram bar, a ScreenTip appears.
It displays the number of times the phone occurs in data sources of the open project.
Normally: The number of times the phone occurs, not including uncertainties.
As primary uncertainty: The number of times the phone occurs in uncertain phone groups as the first phone.
As non primary uncertainty: The number of times the phone occurs in uncertain phone groups, not including primary uncertainties.
If the phone occurs in any uncertain phone groups, the ScreenTip also displays the other uncertain phones that occur in groups with the phone.