This file points to 4 pairs of files of the form    "?s4*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1s40_A	1s40_A_sse
1s48_A	1s48_A_sse
1s4e_A	1s4e_A_sse
1s4n_A	1s4n_A_sse