Figure 23. Side-looking airborne radar (SLAR) image showing lateral ramps in the central Appalachians. A, Overview. Ramps shown by lines are abbreviated as follows: SQ, Susquehanna; SM, Seven Mountains; T, Tyrone-Mount Union; B, Bedford (shown by single line because it is probably a single scissors fault, but may be a ramp with ill-defined edges); P, Pennsylvania-Maryland-West Virginia; M, Mathias; H, Highland County; L, Lexington; R, Roanoke.