ICESat-2 Algorithm Theoretical Base Document for the Atmosphere, Part II: Detection of Atmospheric Layers and Surface Using a Density Dimension Algorithm, v14.0, August 30, 2022, Geomath Code Version v120.0, ASAS Code Release v5.6, ATLAS Data Product ATL09, 477 pp., doi:10.5067/CP08GNGYS4YJ Book