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Blackbody (Fire Color)
First, create a new image 200x200 pixels.
Use the paintbucket tool to paint the background to black color, so your image will be black color.
Go to Filter>Render>Lens Flare, follow the options below:
Then go to Filter>Stylize>Wind, follow the options below:

Method:
Wind
Direction:
From the right
Apply the effects 5 times (or hold down CTRL+F 5 times)
Go to Image>Mode>Grayscale, click OK
Then
Image>Mode>Indexed Color.
Then
Image>Mode>Color Table.

Follow the options below:
After that click OK!
Then you have this:
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