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. Author manuscript; available in PMC: 2012 Sep 15.
Published in final edited form as: Vision Res. 2011 Aug 9;51(18):1995–2007. doi: 10.1016/j.visres.2011.06.020

Figure 1.

Figure 1

The response function of the 3rd order Butterworth filter with the cutoff frequency of 1.5 CPD, equivalent to 1.5 CPL for a 1° letter size.