code: public static Chart getMSDLineChart(ArrayList<Trajectory> t, int lagMin,
  			int lagMax) {
  		return getMSDLineChart(t, lagMin, lagMax,
  				new MeanSquaredDisplacmentFeature(t.get(0), lagMin));
  	}
docs: Plots the mean MSD curve over all trajectories in t.
  @param t List of trajectories
  @param lagMin Minimum timelag (e.g. 1,2,3..) lagMin*timelag = elapsed time in seconds
  @param lagMax Maximum timelag (e.g. 1,2,3..) lagMax*timelag = elapsed time in seconds