Stefano Natali (1), Linda Franceschi (1), Marco Doveri (2) & Roberto Giannecchini (1)
(1) Earth Science Department, University of Pisa, Via Santa Maria, 53, 56126, Pisa, Italy.
(2) Institute of Geosciences and Earth Resources (IGG), National Research Council (CNR), Via Giuseppe Moruzzi, 1, 56124, Pisa, Italy.
Corresponding author e-mail: natali.stefano@hotmail.com