In most cases, you'll want to take time to build clean, uncluttered charts that are easy to read. However, a quick, messy chart is a great way to "sanity check" unfamiliar data. A chart can show you patterns and outliers almost instantly. It can even show when data has been faked. Best of all, you get all of this with almost no effort.
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What can I say. It has worked brilliantly. Thank you so much for your help. - Tracey