Help Solve a Puzzle: Read Figure Below

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hanson
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Hi all.
Please kindly read the figure below and see if you can help me. Thanks.
 
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  • Typed mathematical text on a white background: an evolution equation for a wave, two methods for choosing parameters to build a solitary wave of amplitude 0.1, and the sech-squared solution formulas.
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Both methods are perfectly valid, resulting in solutions with different properties. There are an infinite number of solitoids with height 0.1. What other properties do you want it to have?