1. Agricultural Engineer, Dept. of Enology and Fruticulture, Faculty of Agronomy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile.
2. Full Professor, Dept. of Enology and Fruticulture, Faculty of Agronomy, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile (corresponding author).
3. Dept. of Physics, Universidad Técnica Federico Santa María, Valparaíso, Chile; formerly, Physics Engineer, Dept. of Physics, Faculty of Physics, Universidad de Santiago de Chile, Santiago 7820436, Chile.