Polynomial $ax^2+bx^4+cx^6+dx^8$.

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Theenter image description here the plot of polynomial $-7.7x^2+4.30x^4-0.802x^6+0.0476x^8$, in which two sides wells are shrinked according to middle wells. Can any body guide me which changes in coefficients can be made so that i can get four well of equi-distance and same depth.?