A similarity matrix takes two variables and compares how similar they are to each other by using x and y axes. The matrix in this example takes ten different strains of bacteria, listed 1-10, and compares them to one another. The boxes in black represent 100% similarity because they are relating a particular bacteria to itself. The data is plotted using 7 different intervals, they are all in increments of 10% except of course for the 100% box. None of the bacteria are 90-99% similar according to the data.
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