Improved the plotter [skip CI]
Improved the plotter [skip CI]


Former-commit-id: 60622f2867469e79539e3892e142d107e62c9e9b [formerly d4b69c37b695563094e13f7cc2b3acef7d93bacf]
Former-commit-id: f50721f6425b7843a76b393705d6542c29d2e3ac
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine