Ceilometer Type: LD40 Producer: VAISALA Center wave length: 855 + 2 nm Operation mode: pulsed Pulse duration:75 ns Pulse repetition rate: 6494 Hz Locations: Tenango del Aire, Mexico; 19.1561 -98.8642; Altitude: 2377 m asl; DATE: from March 5, 2006 to April 1, 2006 28 Density files *.PNG 28 Gradient files *.PNG *.zip files by day For further information contact: Rainer Steinbrecher, IMK-IFU; Rainer.Steinbrecher@imk.fzk.de