Figure F10. Total prokaryotic cells (solid circles) and the percentage of cell numbers involved in cell division (open circles) with depth at Site 1227. Dividing cell percentages become increasingly unreliable as total cell counts decrease below 2 x 106 cells/cm3 as within-sample variability rises due to the low number of cells counted. Vertical dashed line on the left represents the detection limit at 1.3 x 105 cells/cm3.