White point of the current display device shifted from -153 mired to +1100 mireds.
This version has chromatic adaptation and perceptual gamut mapping, so the colors are a little less saturated and less pinkish. You might prefer the other graphic below, there is pros and cons for each one of them.
It has been done with Microsoft Excel and Adobe Illustrator.

Every 1/3 mireds, a sample was computed as follow :
Temperature (K) → Planck's law → CIE 2006 2° LMS color matching functions (1nm) → Von Kries chromatic adaptation (6504 K = white) → sRGB color space (Perceptual) → Gamma 2.2 → SVG
Then the whole data set has been optimized in order to rely on gradient interpolation when no visible difference occured.