== '''Red prism''' ==
[[File:RedlambdaThe table and plots on this page can be used to determine the prism position to use.png]][[File:Redorders The table gives the first and last orders and the wavelength range for each prism position.png]] There is likely an uncertainty of +/-1 order, and +/-2 for the points that don't quite fit the trend in the plots below (these odd points are due to having to initialise the prisms between measurements).
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[[File:Redlambda.png]]
[[File:Redorders.png]]
