The grid is there for the [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=829.msg3142#msg3142]Suposition of Two Waves (with different phases)[/url].

For [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=752.0]Superposition of two waves[/url],
I just added horizontal lines for user to adjust height. It will display value for the amplitude.

Please let me know is it what you need!

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