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Cell Size Statistics...

▪ Cell Size Statistics gives statistics for cells within the current notebook.
Total Bytes
Includes overhead for cell data structures.
Content Bytes
Gives the size of text data only. This corresponds to a character count of the text.
Reflect Sharing
Specifies whether infomation that is shared by more than one cell should be counted. Mathematica stores only one copy of a given token (variable name, etc.), even if it is used many times. Therefore, it is not possible to assign the memory used by shared objects to any particular cell. If Reflect Sharing is off, all memory will be counted as if it were not shared, which will over count the actual memory being used. If Reflect Sharing is on, each cell will be assigned the memory used by the token divided by the number of times the token is shared.