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In page Mandelbrot set:

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While the Mandelbrot set is typically rendered showing outside boundary detail, structure within the bounded set can also be revealed.[1][2][3] For example, while calculating whether or not a given c value is bound or unbound, while it remains bound, the maximum value that this number reaches can be compared to the c value at that location. If the sum of squares method is used, the calculated number would be max:(real^2 + imaginary^2) − c:(real^2 + imaginary^2).[citation needed] The magnitude of this calculation can be rendered as a value on a gradient.