FAQ Desktop - titlebar_text_color

A group of 4 numbers, each >=0 and <=255. First number is the red value, followed by green and blue. Last comes the alpha value, where 255 is solid while 0 is invisible.

Version >= 10.1.21: A group of 3 or 4 numbers, each >=0 and <=255. First number is the red value, followed by green, blue and optional alpha (alpha will default to 255 if it is not set)

Additionally, on 870 you can add another 4 numbers describing the color used for the text-shadow. The format is the same, so you'll end up with 8 numbers separated by space.