MATLAB: How to plot this to display a spectrum

Question

I want to plot the intensity against wavenumber.

This is the intensity i believe:

But i dont understand what's val(:,:,1) this runs till val(:,:,729)

and this is the wavenumber:

and it runs from 1 to 729

i tried to plot x = wavenumber and y = ref_Raw and plot (x,y)

however it was reflected

??? Error using ==> plot Data may not have more than 2 dimensions

do need help with this!

thanks

Answer 1

x = wavenumber;
y = transpose(squeeze(ref_raw));
plot(x,y);