Vertical PI, PI Elevation = Station and elevation of VPI's (Vertical Points of Intersection).
Length In, Length Out = Curve length in and out.
Grade In, Grade Out = Grade in and out expressed as a percent as in 10.36%.
BC, BC Elevation = Station and elevation of BC (Beginning of Curve).
EC, EC Elevation = Station and elevation of EC (End of Curve).
You can enter values for any of the items in this screen, but you will probably want to let TPC generate the information for you.
This section lists basic tasks relating to vertical curves.