1. Department of Physics, University of Pavia, Via Agostino Bassi 6, 27100 Pavia, Italy
2. Arvedi Laboratory of Non-Invasive Diagnostics, CISRiC, University of Pavia, Via Bell’Aspa 3, 26100 Cremona, Italy
3. Department of Musicology and Cultural Heritage, University of Pavia, C.so Garibaldi 178, 26100 Cremona, Italy
4. Laboratory of Applied Diagnostics for Cultural Heritage, Cr.Forma Restoration School, C.so Matteotti 17, 26100 Cremona, Italy