This file points to 4 pairs of files of the form    "?v2*"
("?" is a single-character wildcard and "*" is a multiple-character wildcard.)

Crossing File	Backbone Overlay
1v27_A	1v27_A_sse
1v2a_A	1v2a_A_sse
1v2x_A	1v2x_A_sse
1v2y_A	1v2y_A_sse