One of those real candle flames that I posted looks to me like three ellipses one inside another (speaking two-dimensionally) so I tried to very simplistically reproduce it in GIMP. Here's what I did, with the real flame for comparison. What struck me most was that the GIMP thumbnails top left look surprisingly good approximations to the real flame.

I had a play with bagginsbill's matmatic-generated shader in Poser's material room to see if I could introduce a similar gradation of colour from the bottom to the tiop of the falme, specifically by plugging other nodes into the Inner_Color and Outer_Color inputs of the orange/yellow EdgeBlend node and altering the Saturation and Value of the HSV node connected to Alternate_Diffuse. 

No luck so far.

And no, I can't work out the maths to do it in the matmatic script itself.

P.S. I'm ignoring the blue zone here because I think that's already sorted.

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).