Origin on 2₁

Asymmetric unit

0 ≤ x ≤ 1; 0 ≤ y ≤ 1/2

(1)  1

(2)  2(1/2, 0, 0)   x, 0, 0

Generators selected (1); t(1, 0, 0); t(0, 1, 0); (2)

Positions

Multiplicity, Wyckoff letter, Site symmetry	Coordinates	Reflection conditions
		General:
2 a 1	(1) x, y, z (2) x + 1/2, -y, -z	h0: h = 2n

Symmetry of special projections

Along [001]   p1g1 a' = bp   b' = -a    Origin at 0, 0, z

Along [100]   211 a' = b    Origin at x, 0, 0

Along [010]   11g a' = a    Origin at 0, y, 0

Maximal non-isotypic subgroups

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I

[2] p1 (1)

1

IIa

none

IIb

none

Maximal isotypic subgroups of lowest index

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IIc	[2] p2111 (b' = 2b) (9); [3] p2111 (a' = 3a) (9)

Minimal non-isotypic supergroups

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I	[2] p21/m11 (15); [2] p21/b11 (17); [2] p2122 (20); [2] p21212 (21); [2] pm21b (28); [2] pb21m (29); [2] pm21n (32); [2] pb21a (33)

II	[2] c211 (10); [2] p211 (a' = 1/2a) (8)

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