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When running multi-core with mpi one has to use the small data "callbacks" kwarg to receive the data gathered from all nodes.  An example multi-core script is below (also works on 1 core).  A pure 1-core script is simpler (no data "gathering" needed: can just be a loop over events with plot updates every N events).  For multi-core, this can be run with "mpirun -n 3 python <scriptname>.py" and the two plots can be viewed on the same node with "psplot -a 1 OPALSUMS OPALIMG" (see Visualization Tools for "psplot" options).  It can also be run in the usual offline manner by changing the DataSource line:

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