In this empirical model [2, ], it is assumed that the pedestal density is proportional to the line averaged electron density. It was found that the best fit to data from the ITPA pedestal database version 3.1 is

where is the pedestal density in the unit of m^{3} and is the line averaged electron density in the unit of m^{3}. When this model is compared with the 533 data points, the average logarithmic RMS deviation is found to be about 12.1%.

Wed Apr 2 12:00:26 EST 2003