This first article explains the gamma ... the initial function. The formula is: Here is the Taylor development for a simple function (cosine) – the polynomial sticks well to the curve.

You can use the options listed in Table 2.1 to superimpose a fitted theoretical distribution function on your cdf plot. EXPONENTIAL(exponential-options) plots one-parameter exponential distribution ...

However, this cannot easily be achieved whilst retaining the conventional non-linear transfer functions ... gamma curve to support the production, exchange and end user distribution of high ...