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. Author manuscript; available in PMC: 2010 Jan 12.
Published in final edited form as: Phys Med Biol. 1997 Dec;42(12):2493–2516. doi: 10.1088/0031-9155/42/12/014

Figure 11.

Figure 11

Variance spectra for each of the methods that use only photons from a 20% wide photopeak energy window. The spectra have been expressed using the common basis formed by the left singular vectors of the 20% Window RBSC design matrix.