Title	Primary Author
Validation of Mapping Functions	Stefan Riepl
Zimmerwald Dual-wavelength Operation: First Experiences	Werner Gurtner
Two-color laser ranging with the MLRO system	Giuseppe Bianco
Atmospheric Refraction at Optical Wavelengths: Problems and Solutions	Virgilio Mendes
Preliminary estimation of the atmospheric nonlinear frequency dispersion and absorption effects on the pulse SLR accuracy	Yuri Galkin
Wavelength Dependence of Range Correction	David Arnold
Atmospheric Contribution to the Laser Ranging Jitter	Ivan Prochazka
Modification of Laser Ranging Equation	Xiong Yaoheng
A Database of Atmospheric Refractivities from GPS Radio Occultations	Manuel de la Torre Juárez
Biaxial Rayleigh- and Raman-LIDAR for applications in atmospheric sounding and SLR	Ulrich Schreiber

The session on Atmospheric Correction and Multiwavelength Ranging experienced unexpected resonance in terms of the number of the submitted presentations. The session started with presentations dealing with two colour laser ranging at the stations Matera (G. Bianco), Zimmerwald (W. Gurtner) and Concepcion (S. Riepl), the only two colour operational SLR systems in the world. Moreover some considerations on horizontal refractive gradients and features of different mapping functions where given and E. Pavlis discussed the most recently derived mapping function, supplied by V. Mendes. The session went on discussing nonlinear effects in modelling the group refractive delay (Y. Galkin) and the wavelength dependent range offsets of corner cube reflector arrays (D. Arnold), which was followed by theoretical considerations of turbulence effects on ranging jitter (I. Prochazka) and the laser ranging equation (X. Yaoheng). The session was closed by presentations dealing with possibilities of remote sensing of atmospheric parameters by limb sounding (M. de la Torre Juarez) and Rayleigh-LIDAR (U. Schreiber) techniques.