The next one is nearly black at 3 quarter mark, and the last one should be black. The key positions and values are listed below.
Plus you can also download these gradients to put into Afterburn below as well, to save you the trouble of manually making these colours.
Colour 1: Position 0.00. R:255 G:121 B:0.
Colour 2: Position 7.02. R:299 G:75 B:0.
Colour 3: Position 18.17. R:181 G:79 B: 17
Colour 4: Position 38.33. R:12 G:6 B:1
Colour 5: Position 50.00 R: 1 G:1 B:0
You can enter these in by clicking on the ramp, wherever a ramp is you should see it's position value up the top right of the gradient ramp's window.
Now click on the 'Three' button just below the ramps on the 'Use colors:' row. Now we can have three gradients which blend together. Click on the 'Density' button as well so they blend based on the density rather than distance.
Click on Colour 2's ramp now and put the following values in.
Colour 1: Position 0.00 R:253 G:60 B:0
Colour 2: Position 10.50 R:152 G:38 B:30
Colour 3: Position 24.83 R:11 G:7 B:3
Colour 4: Position 50.00 R:1 G:0 B:0
Now Colour 3's.
Colour 1: Position 0.00 R:0 G:0 B:0
Colour 2: Position 50.00 R:0 G:0 B:0
Basically what happens is that the particles will explode out as firey red and orange and then go to colour twos as they start to die and then when they die they turn black (colour 3)
Now if you opted to load the gradients in rather than manually make them download these files and then click on each gradient ramp and right click on the ramp window when it pops up, and choose 'Load' and then put each of these gradients
into the right slot. The gradient files are HERE