= Fourier shell correlation
{c}
{title2=$\operatorname{FSC}(q)=\frac{\sum_{\mathbf k\in S_q}F_1(\mathbf k)F_2^*(\mathbf k)}{\sqrt{\sum_{\mathbf k\in S_q}|F_1(\mathbf k)|^2\sum_{\mathbf k\in S_q}|F_2(\mathbf k)|^2}}$}
<Fourier shell correlation> compares two three-dimensional maps using their complex <Fourier transform> coefficients in successive reciprocal-space shells. Independent half-map refinement helps distinguish reproducible signal from overfitting; masking and correlated inputs can bias the result.
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