There are several possible representations for the actual packet data. Each is described below, with the corresponding format code specified in parentheses.
Every packet is followed by a linefeed, however.
In addition, lines are constrained to be near 80 characters long, for convenience with some editors. In hexadecimal format, each packet is represented in hexadecimal dump format, with each line showing 16 bytes in hexadecimal, followed by the corresponding ascii representation. Output files with the f format discard any packet data, saving just the parameter information. The remaining formats are special purpose, generally for testing. This format records only the header information.