P B A N,NR.50*CS,CZ*
LATT  1
SYMM  0.5-X,0.5-Y,Z
SYMM  0.5-X,Y,-Z
SYMM  X,0.5-Y,-Z
    0 .25 / 0 1 / 0 .5
    P B A N,NR.50*CS,CZ*