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 * $$y(t) = N_0e^{- \lambda (t-L)}$$


 * $$N_0 = 255 $$ (max $$y(t)$$ value)
 * $$L =$$

$$ y(U) = 1 $$ where $$U = $$ Thus:
 * $$ \lambda = -\frac{\ln({\frac{1}{N_0}})}{U-L} $$