I 21 3,NR.199*GC,BE*
LATT -2
SYMM    Z,   X,     Y
SYMM    Y,   Z,     X
SYMM .5+X, .5-Y,   -Z
SYMM .5+Z, .5-X,   -Y
SYMM .5+Y, .5-Z,   -X
SYMM   -X, .5+Y, .5-Z
SYMM   -Z, .5+X, .5-Y
SYMM   -Y, .5+Z, .5-X
SYMM .5-X,   -Y, .5+Z
SYMM .5-Z,   -X, .5+Y
SYMM .5-Y,   -Z, .5+X
    0 .5 / 0 .5 / 0 .5
    SONDER: Z .LE. MIN. (X,Y)
    I 21 3,NR.199*GC,BE*