. 2018 Apr 27;74(Pt 5):471–479. doi: 10.1107/S2059798318003078

Table 2. Parameters of fourth-order polynomial fits ρ(x) = a ₀ + a ₁ x + a ₂ x ² + a ₃ x ³ + a ₄ x ⁴ to the density of aqueous CPA solutions in their vitreous/amorphous phase at T = 77 K versus CPA concentration x in %(w/w).

The root-mean-square error (RMSE) and adjusted Inline graphic value is given for each fit.

Cryoprotectant	a ₄	a ₃	a ₂	a ₁	a ₀	RMSE
PPG 425	0.5992	−1.1164	0.2291	0.4605	0.9398	0.00231	0.9965
PEG 200	0.6787	−1.4281	0.6472	0.3962	0.9400	0.00161	0.9993
MPD	0.2085	−0.1907	−0.4414	0.5085	0.9398	0.00169	0.9963
Ethanol	−0.0663	0.7349	−1.3690	0.7389	0.9399	0.00469	0.9755
2-Propanol	0.8019	−1.2588	0.0597	0.4107	0.9890	0.00744	0.9428
Glycerol	0.7988	−1.7791	1.0744	0.3050	0.9400	0.00167	0.9996
Ethylene glycol	0.6169	−1.2632	0.5814	0.3559	0.9399	0.00152	0.9994
Methanol	0.0549	0.3903	−0.9959	0.6134	0.9396	0.00410	0.9726

Table 2. Parameters of fourth-order polynomial fits ρ(x) = a 0 + a 1 x + a 2 x 2 + a 3 x 3 + a 4 x 4 to the density of aqueous CPA solutions in their vitreous/amorphous phase at T = 77 K versus CPA concentration x in %(w/w).