1. Formerly UFPA, Belém, Brazil; presently CENPES/Petrobras, Belém, Brazil..
2. DEP/FEM/Unicamp, Campinas, Brazil, and National Institute of Petroleum Geophysics (INCT-GP), Brazil..
3. UFPA, Belém, Brazil, and National Science and Technology Institute of Petroleum Geophysics (INCT-GP), Brazil..
4. DMA/IMECC/Unicamp, Campinas, Brazil, and National Institute of Petroleum Geophysics (INCT-GP), Brazil..