Improved plot [skip CI]
Improved plot [skip CI]


Former-commit-id: b85798cc05f3154f04bd71155f814d60754e55d2 [formerly 5666a72e45533e1b4149ee30397c49b330408413]
Former-commit-id: a6a2c5fcf04b0469b58dd4a0b1ec1acd38d3e40b
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine