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. Author manuscript; available in PMC: 2011 Jan 26.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2009 Mar 12;7263:813799. doi: 10.1117/12.813799

Figure 1.

Figure 1

(a) The largest 5000 singular values for the FastSPECT II system. Our current computing resources were unable to allocate enough memory to compute more than this number of singular values for the FastSPECT II system. However, this number of elements may be sufficient for system assessment tasks since the spectrum exhibits a significant drop in magnitude within the 5000 computed singular values. (b) The largest 6082 singular values for the M3R system. The Lanczos method is subject to numerical instability for small singular values. The 6082 computed values represents the number of eigenvalues that could be computed for this system before arriving at this stability threshold.