Table 4. A search for higher metric symmetry in SAXDUR using XPREP. Tetra­gonal-I was dismissed, in part due to its much higher R _sym. All four remaining cells are pseudo-tetra­gonal. C-centred equivalents of the monoclinic-I cells are not shown.

Option A:	FOM = 0.077 deg. TETRAGONAL I-lattice R(sym) = 0.195 [5588]
Cell:	14.688 14.727 15.244 90.04 90.03 89.99 Volume: 3297.48
Matrix:	-1.0000 -1.0000 0.0000 -1.0000 0.0000 -1.0000 0.0000 -1.0000 -1.0000
Option B:	FOM = 0.050 deg. ORTHORHOMBIC I-lattice R(sym) = 0.119 [5445]
Cell:	14.688 14.727 15.244 89.96 90.03 90.01 Volume: 3297.48
Matrix:	1.0000 1.0000 0.0000 1.0000 0.0000 1.0000 0.0000 1.0000 1.0000
Option D:	FOM = 0.030 deg. MONOCLINIC I-lattice R(sym) = 0.104 [3620]
Cell:	14.727 14.688 15.244 90.03 90.04 89.99 Volume: 3297.48
Matrix:	1.0000 0.0000 1.0000 1.0000 1.0000 0.0000 0.0000 1.0000 1.0000
Option F:	FOM = 0.044 deg. MONOCLINIC I-lattice R(sym) = 0.099 [3615]
Cell:	14.688 14.727 15.244 89.96 90.03 90.01 Volume: 3297.48
Matrix:	1.0000 1.0000 0.0000 -1.0000 0.0000 -1.0000 0.0000 1.0000 1.0000
Option H:	FOM = 0.050 deg. MONOCLINIC I-lattice R(sym) = 0.106 [3625]
Cell:	14.688 15.244 14.727 90.04 90.01 89.97 Volume: 3297.48
Matrix:	1.0000 1.0000 0.0000 0.0000 -1.0000 -1.0000 -1.0000 0.0000 -1.0000