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

Crossing File	Backbone Overlay
1spp_B	1spp_B_sse
1spv_A	1spv_A_sse
1spx_A	1spx_A_sse
2spc_A	2spc_A_sse