# title = "BL 420: 600 l/mm"
# type = grating
# gmm = 600 groves/mm
# blaze = 14.15 deg
# reflectance = 0.775
# eff1 = KPNO/Gratings/BL420.1        # First order measured efficiency
# eff2 = KPNO/Gratings/BL420.2        # Second order measured efficiency
