This file points to 3 pairs of files of the form    "?i9*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1i9g_A	1i9g_A_sse
1i9s_A	1i9s_A_sse
1i9z_A	1i9z_A_sse