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#' @param group_by A `character` vector. When not `character(0)` (the default),
#' indicates the `travel_matrix` columns that should be used to group the
#' accessibility estimates by. For example, if `travel_matrix` includes a
#' departure time column, that specifies the departure time of each entry in
#' the data frame, passing `"departure_time"` to this parameter results in
#' accessibility estimates grouped by origin and by departure time.
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