Caution: This card requires spelling with a lower-case x.
*FIxC r11, r12, r13, i11, i12, i13 r21, r22, r23, i21, i22, i23 ...
r11: r*8: Radius
r12: r*8: x-coordinate
r13: r*8: y-coordinate
i11: i*4: x-DOF [0 for free, 1 for fixed]
i12: i*4: y-DOF [0 for free, 1 for fixed]
i13: i*4: z-DOF [0 for free, 1 for fixed]
This card is similar to *FIXC, but it allows selecting individual degrees of freedom to be fixed. Six degrees of freedom are required to be constrained to prevent rigid-body motion during the process simulation.