Refering to EE>Examples>LinearFit (https://code.earthengine.google.com/598af3369de7a4845f0325030a66e0e1) I would like to check my understanding.

On line 20 comment says:

// Display trend in red/blue, brightness in green.

Can I think (or is it correct) that since brightnesss is a scalar then it is mapped to a single color, green. But trend is a vector, which can be decomposed in two components, so it is mapped to two colors, red and blue? Does it matter which one is horizontal/vertical component, should I use red/blue or blue/red?

Additionally, where the max value 63 of the stable lights first asset came from?

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