Figure F92. MST-NGR and core K₂O data for Section 185-801C-14R-3. Schematic lithologic column and section photo are on the left, with discrete AA samples indicated. A. Actual AA K₂O measurements are shown as large open circles (data in Table T23). Interpolated K₂O (bars with diagonal fill) are calculated by apportioning discrete analyses over 10-cm intervals (see Table T24 for proportions) such that they are comparable to the footprint of the MST measurements. B. Routine MST-NGR measurements (whole-round with 20-s readings every 10 cm). C. Half-round data for longer counting times. The striped bars are the average and standard deviation of two MST passes with 60-s readings every 10 cm, and the gray bars are the same for three MST passes with 20-s readings.