[[file:oiloil-and-oilsource-rock-correlations_fig8-1.png|300px|thumb|{{figure number|1}}Application of cluster analysis in using data on trace-element concentrations to correlate eleven crude oils from northern Alaska. From Curiale;<ref name=ch08r8 /> reprinted with permission of the American Chemical Society.]] | [[file:oiloil-and-oilsource-rock-correlations_fig8-1.png|300px|thumb|{{figure number|1}}Application of cluster analysis in using data on trace-element concentrations to correlate eleven crude oils from northern Alaska. From Curiale;<ref name=ch08r8 /> reprinted with permission of the American Chemical Society.]] |