Bins of a spectrum: one tone, and where it leaks

Slide a tone across the bins of a DFT. On a bin it is one clean bar; between bins it leaks everywhere, unless a window tapers the seam.

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Where the numbers come from

gHashTag/t27 specs/fpga/dsp/signals.t27 (t27#8985): every value on the page is its fn bodies, compiled to wasm (logic.js)
F. J. Harris, On the use of windows for harmonic analysis with the discrete Fourier transform, Proc. IEEE 66(1), 1978
R. G. Lyons, Understanding Digital Signal Processing, 3rd ed., ch. 3: the DFT, leakage and windows