more commenting on Curve.ordinate_for
more commenting on Curve.ordinate_for


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Former-commit-id: fb685f9475f44ad48f8e72819da2c86850b6df7e
Former-commit-id: 6ec848cd24fc1ae644a331d7ab7ad3d1f3a0d63e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine