*FIxZ
r11, r12, r13, r14, r15, r16, i11, i12, i13, i14
r21, r22, r23, r24, r25, r26, i21, i22, i23, i24
....
r11: r*8: min x-coordinate
r12: r*8: max x-coordinate
r13: r*8: min y-coordinate
r14: r*8: max y-coordinate
r15: r*8: min z-coordinate
r17: r*8: max z-coordinate
i11: i*4: x-coordinate [0 for free, 1 for fixed]
i12: i*4: y-coordinate [0 for free, 1 for fixed]
i13: i*4: z-coordinate [0 for free, 1 for fixed]
i14: i*4: load case number
*FIxZ expands further upon the controls allowed by *FIxR, describing cubes wherein the specified directional displacements are fixed, as opposed to the area described by *FIxR and similar mechanical constraints which are applied to the base of the substrate.