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.

---

The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) 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.