$t_{\rm DM} = 8.3~{\rm DM}~\Delta \nu_{\rm BW} / \nu^3\: \mu$ s, where DM is the dispersion measure (pc cm^-3), $\nu$ is the observing frequency (GHz) and $\Delta \nu_{\rm BW}$ the filterbank channel bandwidth (MHz).

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

These profiles are publicly available from the European Pulsar Network (EPN) archive maintained by the MPIfR, Bonn, http://www.mpifr-bonn.mpg.de/div/pulsar/data/

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... worse

Note that there is a possibility that the nature of the PBF may evolve from the well established exponential form, in the regime where $\Delta\nu_{\rm d}$ is the easier quantity to measure. However, there is no evidence of this from the main theoretical models (e.g. Lambert & Rickett 1999, and references therein).

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.