Number of independent wavelengths used in the computation of the mean
spectral resolution.  The values trended here are for the 300V grism
with a slit width of 1.0" and the order separation filter GG435.
Data have been acquired using the blue-sensitive EEV detector.
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More information can be found on
the <a href="http://www.eso.org/observing/dfo/quality/FORS2/qc/moswlc/moswlc.html">plot tutorial page</a>