Table 1.

The confinement effect in ion liquid (IL) solution.

	IL1	IL2	IL3	Wat1	Wat2	Wat3
AC-PCA	212	167	173	307	301	268
HP-PCA	—	217	203	350	352	341
LPH-PCA	340	321	333	345	357	354
LWPH-PCA	—	211	186	354	295	313

The area of distribution of each MD trajectory repeat. The area is counted as the number of grids with population larger than 5% of the largest population grid. Four different methods are considered, including the atom-coordinate-based PCA (AC-PCA), the helical-parameter-based PCA (HP-PCA), the LPH-based PCA (LPH-PCA), and LWPH-based PCA (LWPH-PCA). We have not listed the area for IL1 from HP-PCA and LWPH-PCA, as dynamic transition is observed in these representations and the area cannot be treated as the measurement of degree of conformational fluctuation.