* Once you have the correct grating in the spectrograph, you can determine the desired grating angle from ....., enter this in the "Grating angle" box and click "Go".
* Any required order blocking filters for your grating setting are listed in the table below.....: select them Select the required filter from the dropdown menu below the grating angle control.
{| class="wikitable" border="1"|-! Grating! Order! Star Filter! Arc Lamp! Arc Filter|-| 4| 1| None| CuAr| None|-| 5 | 1| GG495| CuNe| GG495|-| 5| 2| BG39| CuAr| BG39|-| 6| 1| None| CuAr| None|-| 7| 1| None| CuAr| BG38|-| 8| 1| GG495| CuAr| GG495|-| 8| 2| BG39| CuAr| BG39|-| 9| 1| GG495| CuAr| GG495|-| 9| 2| BG39| CuAr| BG39|-| 10| 1| GG495| CuAr| GG495|-| 11| 1| GG495| CuAr| GG495|-| 12| 1| GG495| CuAr| GG495|} Automated grating angle determination....is on the cards, but has yet to be implemented.
===Arc lamp and filter selection===