A few questions about the solar Lyman Alpha profile as presented here. 1) This is from a 1978 study - are there more recent (higher resolution) profiles ? 2) The scale at the bottom is confusing - how does it relate to a wavelength scale ? 3) Where in the profile is the actual Lyman alpha line measured or is it obtained statistically ? 4) Why twin peaks and are these replicated in Lyman beta, delta etc ? 5) Is there any significance to the peak to peak measure (about 33 picometers as I see it) ? Spacing between Lyman Alpha (H) and Lyman Alpha (Deuterium) is of the same order of magnitude so I wondered if there was any connection. Any answers would be greatly appreciated.