What is Spectral-Spatial ROI in Elevayta Extra Boy Pro?

[cpmame]

Can anyone explain to me what is the x-axis in the 2D Spectral-Spatial ROI in the Elevayta Extra Boy Pro?

Thanks

[Lunch Money]

Isn't this something that's explained in the user manual?

[Space Boy]

yes,

....and the full user manual is supplied with the demo