2.4 Comparison of topside and bottomside MFL contour plots: Figure 5 shows a example comparison of topside MFL versus bottomside MFL signal contour plots. Results are for large dents, 5.0mm deep, both pre and post-anneal. The background flux density is B=1.8T. Interestingly, there is little difference between the results, except in overall signal magnitude. All other dent geometries exhibited the same similarities between topside and bottomside MFL signals.