FSSP ground test was done on May 24 in Norman. Glass microspheres of three different sizes were passed through the instrument, using a vacuum cleaner to draw air beads through the sample volume.  Based on these bench tests, we computed channel size assignments for equivalent water droplets applicable for the Norman project data. Comparison of integrated liquid water concentration (LWC) from the FSSP with LWC from the DMT instrument suggests that the FSSP calibration based on May 24 bead tests should be used for flights that were done during May-June, 2003. A table with calibration results is shown in Table 1.

Table 1: FSSP calibration for Norman 2003 project.