[QE-users] bands.x and plotbands.x

[cloun]

Greetings to Quantum ESPRESSO professionals,

I am interested in output of plotbands.x command in the case of 
lsym=.true. while bands.x is executed. It is told in some tutorials that

`if symmetry analysis was performed in the previous step [bands.x], the 
output is written toseveral plottable files prefixbands.plot.N.M, whereN 
labels the high-symmetry lines, M labels irreducible representations'.

Could you please explain as precisely as possible what does it actually 
mean? I know some band theory elements, but not those concerning group 
representations and such, so I will be glad to be pointed at a good text 
maybe, after reading which I can deduce the answer myself.

Thanks in advance.

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