Table 4. Superspace groups compatible with the Pnma space group and one modulation wavevector along the a* axis.

Superspace group	Reflection conditions
Pnma(α00)000	hk0m: h = 2n, 0kl0: k + l = 2n
	h00m: h = 2n, 0k00: k = 2n, 00l0: l = 2n
Pnma(α00)0s0	hk0m: h = 2n, h0lm: m = 2n, 0kl0: k + l = 2n
	h00m: h + m = 2n, 0k00: k = 2n, 00 l0: l = 2n
Pnma(α00)00s	hk0m: h + m = 2n, 0kl0: k + l = 2n
	h00m: h + m = 2n, 0k00: k = 2n, 00l0: l = 2n
Pnma(α00)0ss	hk0m: h + m = 2n, h0lm: m = 2n, 0kl0: k + l = 2n
	h00m: h + m = 2n, 0k00: k = 2n, 00l0: l = 2n