According to 

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<ul>
<li> <tt> ESO-327242, Integrating Instrument Performance in the Quality Control Process - X-shooter </tt>
<li> <tt> VLT-SPE-ESO-14650-3323, X-SHOOTER Technical Specification </tt>
</ul>
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The read out noise (RON) is specified to be 
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<ul>
<li> UVB/VIS low gain: <3e-  
<li> UVB/VIS high gain:  <8e- 
<li> NIR (single read out): <15e- 
<li> NIR (multiple nondestructive read out): <5e-
</ul>

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Given the monitored gain values of 
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<ul>
<li> UVB low gain: 1.84 [e-/ADU]
<li> UVB high gain: 0.64 [e-/ADU]  
<li> VIS low gain: 1.66 [e-/ADU]
<li> VIS high gain: 0.64 [e-/ADU]
<li> NIR 2.29 [e-/ADU]
</ul>
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 the following KPI plot reference values can be derived:
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<ul>
<li> UVB low gain: 4.3 ADU 
<li> UVB high gain: 4.7 ADU
<li> VIS low gain: 4.8 ADU 
<li> VIS high gain: 4.7 ADU
<li> NIR (single readout): 6.5 ADU
<li> NIR (multiple nondestructive readout): 2.18 ADU
</ul>