Plots of MI values for an alignment. The axis values represent the sites in the alignment, and the values in the matrix, depicted in color, are the MI values. a) top of page: Standard MI plot of a given alignment. The superimposed black lines are the matrix cells used for RCW the cell in white (under the black lines) b) in the middle: Randomization of the plot in a). c) bottom of page: RCW MI of the same alignment.