* The angles listed in the second last column of the table below will get one into the range where lines are visible for a given grating, then adjust the grating angle to obtain the desired wavelength range - consult the sample arcs in the right-hand column of the table and the arc maps linked to below.
* Click on the following links for arc maps '''Arc Maps''' for '''[[G4]]''', '''[[G5]]''' and '''[[G7]]'''. Arc maps for the remaining gratings will be posted once they are available.
* Click on the following link for '''[[Sample Spectra of Spectrophotometric Standard Stars]]''' observed with G4, G5, G6 and G7.