How to interpret the Memory (Top 10) performance chart in vCenter?

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Performance Chart

I'm trying to interpret the above performance chart from vCenter. The thing is, each of these clusters each has four servers each with 64GB of RAM for a total of 256GB per cluster. What confounds me is that the chart seems to indicate the cluster in red has:

(red-blue)/(total red memory)

utilization. Except the units of measurement are millions of KBs and in this case that would be roughly 360 million KBs which, assuming my math is right, is 360GB, which doesn't make sense to me. Am I misinterpreting this chart?

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