This file points to 4 pairs of files of the form    "?tn*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1tn3	1tn3_sse
1tnr_A	1tnr_A_sse
1tns	1tns_sse
2tnf_A	2tnf_A_sse