Joint (2D) histograms which compares the total electron density (n_T = n_c + n_s) estimated from CS fits with the total moment electron density (n_e), over a 50-day interval in 1995. The solid black line denotes the 1:1 identity relation, and the color scale represents the logarithm of the count number in each bin. Marginal (1D) histograms show the occurrence frequency of n_T (top) and n_e (right). The axis limits for both n_T and n_e have been selected to capture the bulk of the data while excluding extreme outliers.