+The following fields are printed on the output side:
+.TP
+.B OUT
+The total number of bytes transmitted from this interface.
+.TP
+.B PACK
+The total number of packets transmitted from this interface.
+.TP
+.B VJCOMP
+The number of TCP packets transmitted from this interface with
+VJ-compressed TCP headers.
+.TP
+.B VJUNC
+The number of TCP packets transmitted from this interface with
+VJ-uncompressed TCP headers.
+Not reported when the
+.B \-r
+option is specified.
+.TP
+.B NON-VJ
+The total number of non-TCP packets transmitted from this interface.
+Not reported when the
+.B \-r
+option is specified.
+.TP
+.B VJSRCH
+The number of searches for the cached header entry for a VJ header
+compressed TCP packet. Only reported when the
+.B \-v
+option is specified.
+.TP
+.B VJMISS
+The number of failed searches for the cached header entry for a
+VJ header compressed TCP packet. Only reported when the
+.B \-v
+option is specified.
+.TP
+.B RATIO
+The compression ratio achieved for transmitted packets by the
+packet compression scheme in use, defined as the size
+before compression divided by the compressed size.
+Only reported when the
+.B \-r
+option is specified.
+.TP
+.B UBYTE
+The total number of bytes to be transmitted, before packet compression
+is applied. Only reported when the
+.B \-r
+option is specified.
+.PP
+When the
+.B \-z
+option is specified,
+.Nm pppstats
+instead displays the following fields, relating to the packet
+compression algorithm currently in use. If packet compression is not
+in use, these fields will all display zeroes. The fields displayed on
+the input side are:
+.TP
+.B COMPRESSED BYTE
+The number of bytes of compressed packets received.
+.TP
+.B COMPRESSED PACK
+The number of compressed packets received.
+.TP
+.B INCOMPRESSIBLE BYTE
+The number of bytes of incompressible packets (that is, those which
+were transmitted in uncompressed form) received.
+.TP
+.B INCOMPRESSIBLE PACK
+The number of incompressible packets received.
+.TP
+.B COMP RATIO
+The recent compression ratio for incoming packets, defined as the
+uncompressed size divided by the compressed size (including both
+compressible and incompressible packets).