What is the amplitude of this graph?
http://fooplot.com/#W3sidHlwZSI6MCwiZXEiOiJzaW4oeClzaW4oeCkiLCJjb2xvciI6IiMwMDAwMDAifSx7InR5cGUiOjEwMDAsIndpbmRvdyI6WyItNS43NiIsIjcuMjQiLCItNC44MiIsIjMuMTgwMDAwMDAwMDAwMDAwNiJdfV0-
In my exam I had put 1, yet the teacher said the answer was 0.5...