plotMI plots the original data, the symbolic or discretized data, and
  the mutual information at multiple lags. It is a helper function for
  muti.
plotMI(x, y, MI, sym, n_bins, normal)
| x | First vector of data. | 
|---|---|
| y | Second vector of data. | 
| MI | A  | 
| sym | A logical indicator as to whether symbolic dynamics were used. | 
| n_bins | The number of bins used for computing the MI. | 
| normal | A logical indicator as to whether the MI was normalized to [0,1]. | 
A 3-panel plot of original vectors (top), their discretized values (middle), and the mutual information at multiple lags (bottom).