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

Crossing File	Backbone Overlay
1rx0_A	1rx0_A_sse
1rxw_A	1rxw_A_sse
1rxx_A	1rxx_A_sse
1rxy_A	1rxy_A_sse