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

Crossing File	Backbone Overlay
1sgo_A	1sgo_A_sse
1sgp_E	1sgp_E_sse
1sgv_A	1sgv_A_sse
4sgb_I	4sgb_I_sse