This file points to 3 pairs of files of the form    "?d7*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1d7p_M	1d7p_M_sse
1d7q_A	1d7q_A_sse
1d7y_A	1d7y_A_sse