OPAL writes two kind of data:
For postprocessing we recommend to use the pyOPALTools Python package which contains many tools for pre- and postprocessing, and analysing and plotting output data.
The statistical data can be conveniently plotted with gnuplot, as shown in the example section Cyclotron.
For the h5 data we provide a root based plotting utility H5root. H5root is part of the binary package. A phase space density plot is shown below.