Fixed plotter [skip hazardlib][demos]
Fixed plotter [skip hazardlib][demos]


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Former-commit-id: a5c8b21ad8441cfdd8ececbea2b14f7e22719991
Former-commit-id: e6f31474b15a1e225240b0773909d8d7fd468324
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine