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Could somebody tell me the format in which the wavefunction is written out by VASP? The user guide is not clear enough.

the file is written unformatted, sequentially. The data it contains are:
rdumy, spins, tag
#(kpoints), #(bands), E_cutoff, lattice vectors
do (for all spins):
do (for all k-points):
#plane waves(kpoint), k-point coordinate, ((eigenvalues, fermi weigths) for all bands)
do (for all bands):
wavefunction coefficients (plane waves)
end do
end do
end do
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