What is the instrumental width of 2" EIS slit ? The I.W. of 1" slit is approximately 0.055 A, however, there is big confusion with 2". This must be higher, however, in what values? What should be its value range ?--- A.K. Srivastava ---- The instrumental width of the 2" slit has not yet been determined but Charlie Brown (NRL) is working on this. We will update the wiki when the value is known. --[LouisaBradley|http://null], 12-Sep-2007