Table 4.

Determined values of ∆n₀ and β by Haller’s approximation and estimated birefringence (∆n) and order parameter (S) at 90 °C.

Entry	∆n0	β	∆n (90 °C)	S (90 °C)
M5	0.21	0.18	0.12	0.60
M6	0.26	0.23	0.13 [a]	0.50 [b]
P1	0.31	0.22	0.22	0.69
P3	0.26	0.23	0.18 [a]	0.69 [b]

^[a] Value in smectic A phase. ^[b] calculated using Δn (90 °C) value in smectic A phase.