This chart shows marriages in England and Wales by average age at first marriage. The chart 
goes from 1890 to 2011. The overall trend is that the groom is older than the bride and these 
tend to rise and fall together. In 1890 the average age of the groom was 26 while the bride 
was 24. In 2011 the average age of the groom was  31 and the bride was 29.
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        [heat] = plotSpotlight(im,heatmap,3);