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. Author manuscript; available in PMC: 2016 Apr 21.
Published in final edited form as: Phys Med Biol. 2015 Mar 27;60(8):3175–3191. doi: 10.1088/0031-9155/60/8/3175

Figure 2.

Figure 2

This plot represents the decomposition space used throughout this study. The circles represent basis material thicknesses used for calibration. The X’s represent combinations of materials used to test the estimators and to determine the number of hidden processing elements.