This chart shows the world's biggest employers. The U.S. Department of Defense is the largest 
with 3.2 million employees. Next biggest is Chinese People's Liberation Army at 2.3 million. 
Third on the chart is Wal-Mart at 2.1 million employees.
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Matrix dimensions must agree.

Error in plotSpotlight (line 30)
    output = repmat(a,[1 1 3]).*single(im)/255;

Error in plot_individual_user_maps (line 49)
        [heat] = plotSpotlight(im,heatmap,3);