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. Author manuscript; available in PMC: 2019 Sep 25.
Published in final edited form as: J Struct Biol. 2015 Aug 13;192(2):216–221. doi: 10.1016/j.jsb.2015.08.008

Figure 2:

Figure 2:

Diagnostic image from micrograph #1 of set #7 of the CTF challenge, output by CTFFIND4 using runtime parameters detailed in Table 3. The 2-dimensional CTF (CTFfit) is overlayed onto the preprocessed amplitude spectrum (Ad) up to the radius corresponding to gmax.