cubic diamond    comment line
 3.7             universal scaling factor
 0.5 0.5 0.0     first  Bravais lattice vector
 0.0 0.5 0.5     second Bravais lattice vector
 0.5 0.0 0.5     third  Bravais lattice vector
 C               species new format
 2               number of atoms per species
direct           direct or cart (only first letter is significant)
 0.0 0.0 0.0     positions
 0.25 0.25 0.25
