5. Write the systematic absences that would be expected for each of the symmetry elements below. In each case, assume monoclinic symmetry with the b-axis unique. (a) Two-fold rotation axis parallel to b. (b) Two-fold screw axis parallel to b. (C) Inversion center at the origin. (d) Glide plane at y = 0 perpendicular to b, translation in c-direction. 5. Write the systematic absences that would be expected for each of the symmetry elements below. In each case, assume monoclinic symmetry with the b-axis unique. (a) Two-fold rotation axis parallel to b. (b) Two-fold screw axis parallel to b. (C) Inversion center at the origin. (d) Glide plane at y = 0 perpendicular to b, translation in c-direction