This file points to 5 pairs of files of the form    "?ap*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1ap8	1ap8_sse
1apj	1apj_sse
1apy_A	1apy_A_sse
1apy_B	1apy_B_sse
2apr	2apr_sse