Not understanding the colour mapped Electronic bands structure

[Souravhirg]

Hello,
Thank you for such wonderful code. I have compiled all the steps for plotting bands structure of Si within the tutorial directory of band-up. After executing the forth step i found a bands structure of Si with a color scale plotting in Matplotlib. I do not understand the color map. what the color map signifies? please clear my confusion. Also I am running the code with QE version 6.1. For higher version of QE like 6.7, I found error in the forth step of band-up Si tutorial case. why this is so? Is it not consistent with higher version of QE?

Thanking you,
Sourav