##' Utility functions fo Ion Mobility mass spectrometry dat
##'
##' @param object An object of type `Spectra`
##' @param fcol A character vector indicating the ion mobility dimension column
##' default is "IonMobilityDriftTime"
##' @return An estimate of the pusher frequency
##' @md
##'
##' @rdname IonMobility-util
##' @example
##'
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