Figure F90. Comparison of densities determined from downhole logs, discrete samples of cores, multisensor track GRAPE measurements, and of compressional wave velocities from downhole logs and discrete core samples (see "Physical Properties"). Also shown are trends for the data from discrete samples and from the MST after applying a robust mode filter, as described in the text (see "Seismic Stratigraphy"). This facilitates more rapid comparison among data sets, as outliers are removed by the filter.