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     Controls how the size of attached files is displayed in the header.
     Either  the  exact  byte  size,  the  rounded  kbyte  size,  or not
     displayed at  all. If  the kbytes  setting is  chosen, the value is
     rounded according to the following formula: kbytes = (bytes +  512)
     / 1024. So a 600 bytes file is rounded up to "1k", but a 500  bytes
     file is rounded down to "0k".