VI	Vacuum impregnation
C	Citric acid solution
DMV	Dry mass variation (-)
DW	Distilled water
J	Apple-pear juice
MV	Mass variation (-)
SG	Solid gain (g/g i.d.m.)
M 0	Initial mass of sample (g)
Mτ	Mass of sample after impregnation (g)
m 0	Initial dry matter of sample (g)
mτ	Dry matter of sample after impregnation (g)
τ	Time of vacuum impregnation phase (s)
a, b, c, d, f	Parameters of SG model (Equations (1),(5)–(7)) (kg/kg)
Υ	Mean of experimental value of SG (Equations (5)–(7))
MRi,p	Predicted value of SG
MRi,e	Experimental value of SG
N	Number of observations
n	Number of constants in model equation
Se	Standard deviation of the residual component
Yt	Arithmetic average of the y variable
SSM	Sum of squares for the model
SST	Total sum of squares
yr	Actual value of the dependent variable (measured)
yt	Expected value of the dependent variable (based on the regression model)
yś	Arithmetic average of the actual dependent variable
RMSE	Root mean square error
χ2	Test reduction coefficient
Ve	Residual variance coefficient
R2	Determination coefficient
Subscripts
0	Initial
τ	Time (s)
A, B, C…	Indicate significant differences