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Figure 1-6 and 1-7 look very different, and it could be hard to see that they are documenting the same set of data. This manipulation of data and how it is viewd can be used for very specific intents. If I wanted a client to see that my business has a consistent viewer rate, I would show them them figure 1-7's monthly chart, because of how smooth it looks. To me at first glance, it seems much more "consistent" than figure 1-6, with all of its spikes.