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This article [J. Biomed. Opt. 16, 046010 (2011)] was originally published online on 7 April 2011 with an error in the x axis label of Fig. 2. The frequency should read (MHz). The corrected figure appears below.
Impulse response of the photoacoustic system along with the theoretical spectra for uniformly absorbing spheres with radii of 1, 5, and 10 mm.
All versions of the article were corrected on 20 April 2011. It appears correctly in print.
