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Hi,
try these parameter:
skinparam nodesep 10skinparam ranksep 20
http://www.plantuml.com/plantuml/uml/RSz12i8m40NG_PnYBb1fsgwbdaDS3CcWeSaa914NujsD1A64hZxpFdynQowKojCxo9kLI8ayIZ2SEQ8QTvX8jXzE5JKvHdKQ8R4k9FTwuIL6PpKL6mJVkq877uFgOUfXxc61jiJX-h36iDnCUCbm_kzR7BSpGilZUa7u0Amiflxz1G00
BR,
Michael