Fitting curve is using 0 zeros of Riemann's zeta function ζ(s).
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 tsujimotter (2015), "An application on Riemann's Prime Number Formula Has Updated (In Japanese:「リーマンの素数公式の可視化アプリがパワーアップしました」)".
 tsujimotter (2014), "Making an application on Riemann's Prime Number Formula (In Japanese:「リーマンの素数公式を可視化する」)".
 Riemann, B. (1859), "On the Number of Prime Numbers less than a Given Quantity".
 Riesel, H. and Gohl, G. (1970), "Some Calculations Related to Riemann's Prime Number Formula", Mathematics of Computation, Vol. 24, No. 112, 969-983.
 Odlyzko, A., "Tables of zeros of the Riemann zeta function".