Yeah, got it!
static {
for(int i = 0; i <= 15; ++i) {
float f = (float)i / 15.0F;
float f1 = f * 0.6F + (f > 0.0F ? 0.4F : 0.3F);
float f2 = MathHelper.clamp(f * f * 0.7F - 0.5F, 0.0F, 1.0F);
float f3 = MathHelper.clamp(f * f * 0.6F - 0.7F, 0.0F, 1.0F);
field_235542_k_ = new Vector3f(f1, f2, f3);
}
}