Oops, thought you meant the graphs (with the dotted/solid lines) in the writeup.
If you're referring to the image under "Visualizing Quantized Word Vectors" then each row is a word vector (and there are only two colors since each parameter is either -1/3 or +1/3).
If you're referring to the image under "Visualizing Quantized Word Vectors" then each row is a word vector (and there are only two colors since each parameter is either -1/3 or +1/3).