This plot shows the resolving power. 

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The spectral resolution (resolving power) R = Lambda / DeltaLambda as
calculated by the pipeline and stored in the QC1 DB is given 'per sigma'. 
These values are divided by 2.3548 ( = FWHM / sigma = 2 sqrt( 2 ln(2) ) ) 
for the plot to be expressed in 'per FWHM'