Chapter 13: Spectroscopic Reference Material 13.1 Introduction 13.2 Using the Information in this Chapter 13.2.1 Wavelength Ranges 13.2.2 Grating Sensitivities and Throughputs 13.2.3 Signal-To-Noise Plots 13.2.4 Plate Scales 13.2.5 Apertures 13.2.6 Fiducials on Bars 13.2.7 Spatial Profiles 13.2.8 Line Spread Functions (Instrumental Profiles) 13.3 Gratings 13.4 Apertures 13.5 Spatial Profiles 13.6 Line Spread Functions 13.7 Spectral Purity, Order Confusion, and Peculiarities 13.7.1 Recommendations for Stellar Observations with Narrow Slits 13.7.2 Order Overlap and Scattered Light for Echelle Gratings 13.7.3 Spectroscopic Mode Peculiarities 13.7.4 Railroad Tracks 13.8 MAMA Spectroscopic Bright Object Limits