1.   The direction of transcription is shown by large arrows.

2.   The large arrows Mark the locations of two steps bounding the cusp, which were observed very near the UHF beam.

3.   The large arrows refer to the central location of DH sites and the smaller arrows refer to minor DH sites.

4.   A large arrow points west.

5.   Large red arrows show where smugglers and illegal immigrants try to flank them.