WFN.OUT     ! name of output WFN file
4 4 4       ! final k-grid
0.0 0.0 0.0 ! final k-shift
2           ! total number of input WFN files
8           ! total number of k-points in all input WFN files
wfn_0/WFN   ! name of 1st input WFN file
wfn_1/WFN   ! name of 2nd input WFN file
1.0         ! relative weight of 1st input WFN file
1.0         ! relative weight of 2nd input WFN file
