When a person see a cell with blue fills of varying lengths representing the values, the cells most likely have data bars applied to them.
Data bars are known to be a kind of conditional formatting that alters based on the data that is said to been shown.
The bigger the number, the fact still remains that the longer the bar that appears in a cell. They often do look like an advanced feature but they are said to be easier to input the data bars to a spreadsheet in Excel using few clicks.
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