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


Former-commit-id: 9810b9ff7b9c6328674254c9b5607c7f5724dd47 [formerly 154349e4d0134d344fd1461f40870c6dc1c510b2]
Former-commit-id: fb685f9475f44ad48f8e72819da2c86850b6df7e
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine