code: public double[] getDts(int from, int to) {
  		double[] ret = new double[to-from];
  		for (int i = from; i < to; i++) {
  			ret[i-from] = this.dts[i];
  		}
  		return ret;
  	}
docs: Get the temporal profile of a portion of this this {@link Trajectory}.
  @param from The index of the starting path point.
  @param to The index of the last path point.
  @return The temporal profile of a portion of this this {@link Trajectory}.