This RO contains the results of the geodetic inversion of the 2011-2013 InSAR data at Campi Flegrei (Italy) due to the action of a deep magmatic source. VSM performs geophysical inversion modeling of observation of ground deformation to retrieve the parameters of the causative magmatic source. The VSM tool carries out this task by minimizing the difference between the observed and the computed displacement field, through a process called data inversion.The VSM software tool is developed by INGV, in Fortran 90. The non-linear inversion core is by M. Sambridge. Please refer to documentation for further information.