"Mountain plot" of a NoV ORF1 sequence region with an entrophy equals to zero. A mountain plot representing a secondary structure in a plot of height versus position is shown. Sequences from positions 3922 through 3973 of the alignment are shown at the bottom of the figure. Numbers at the top of the figure show site position in the alignment. Colors correspond to the Vienna RNA conservation coloring schema  (see also Fig. 3). Note that the AAACG motif (underlined in red) is predicted to be located in a loop of the secondary structure.