Table 4. Variability of PLS Histogram Distributions from PLS Score Images of the 12 Formulations of PB Design.

Formulation Number	Number of Pixels in Each Image	Percentage Standard Deviation	Skewness
1	2486	0.26 ± 0.03	−0.022
2	2486	0.03 ± 0.002	0.123
3	2489	0.01 ± 0.03	−0.051
4	2488	0.14 ± 0.03	−0.074
5	2491	0.13 ± 0.03	−0.10
6	2490	0.05 ± 0.02	0.056
7	2496	0.40 ± 0.04	−0.019
8	2461	0.40 ± 0.04	0.029
9	2492	0.16 ± 0.02	−0.019
10	2488	0.23 ± 0.03	−0.018
11	2477	0.09 ± 0.02	0.079
12	2489	0.03 ± 0.003	0.004