# Visualizing input and output files¶

## Point data¶

Point (receiver) data are output in the ASDF file format. Please see the ASDF website for details and documentation.

## Volume and surface data¶

Meshes and wavefield data are read and written as HDF5 files. The HDF5 library allows us to performantly access single files in parallel, as well as allowing for the portable sharing of such files. To see a visual representation of what's in these files we recommend using Paraview. When installing Paraview, be sure to follow the instructions given in our "Installation" section.

Files are visualized in Paraview using the XDMF standard. This is why you'll see for every mesh, surface, or volume output file used by Salvus, an associated file with the same name but with a .xdmf file suffix. It is this .xdmf file that should be opened in Paraview. When you do open such a file, you should see a dialogue box which looks similar to the following image: