Pulsar Dispersion Measure Dedispersion

Delay $\Delta t = \mathrm{DM} / (2.41 \times 10^{-4})(1/f_{\mathrm{MHz}}^2 - 1/f_{\mathrm{ref}}^2)$ ms; the dynamic spectrum shows the $f^{-2}$ sweep, the dedispersed time series peaks sharply at the true DM and flattens out everywhere else.