(1/2-atan((x-1.2)*90)/PI)*(0.9568931386384+8.5572004774205*exp(0.606431771347*x-1.4569358550228))+(atan((x-1.2)*90)/PI+1/2)*(2.465663751772+0.62077730552679*exp(1.15071723663x-0.797812226407))

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