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You can use GID both for preprocessing (mesh generation) and post processing (plotting). You get extra files with Tochnog professional to interface with GID. The use of GID is recommended. GID is available at the www.gidhome.com Internet page.
With gnuplot you can plot files resulting from control_print_history and control_print_data_versus_data. Also any other x-y plotting program can be used for such files.