Unless otherwise noted, these have a 6 byte header. After this are many gziped sections concatenated together.
{| borderclass="0" cellpadding="3" cellspacing="1" style="background: rgb(0,0,0)" align="centerwikitable"! style="background:rgb(204,204,204); width:50px;" align="center" | Offset! style="background:rgb(204,204,204); width:50px;" | Length! style="background:rgb(204,204,204); width:250px;" | Description
|-
|style="background:rgb(255,255,255);" align="center" | 0x0000|style="background:rgb(255,255,255);" | 2 bytes|style="background:rgb(255,255,255);" | Length of gzipped section 1
|-
|style="background:rgb(255,255,255)" align="center" | 0x0002|style="background:rgb(255,255,255);" | 2 bytes|style="background:rgb(255,255,255);" | Length of ungzipped section 1
|-
|style="background:rgb(255,255,255);" align="center" | 0x0004|style="background:rgb(255,255,255);" | 2 bytes|style="background:rgb(255,255,255);" | File type*
|-
|style="background:rgb(255,255,255);" align="center" | 0x0006|style="background:rgb(255,255,255);" | Varies|style="background:rgb(255,255,255);" | [0x1F8B080000000000...] - Gzip header 1 and data
|-
|style="background:rgb(255,255,255);" align="center" | Varies|style="background:rgb(255,255,255);" | 2 bytes|style="background:rgb(255,255,255);" | Length of gzipped section 2
|-
|style="background:rgb(255,255,255);" align="center" | Varies|style="background:rgb(255,255,255);" | 2 bytes|style="background:rgb(255,255,255);" | Length of ungzipped section 2
|-
|style="background:rgb(255,255,255);" align="center" | Varies|style="background:rgb(255,255,255);" | 2 bytes|style="background:rgb(255,255,255);" | File type*
|-
|style="background:rgb(255,255,255);" align="center" | Varies|style="background:rgb(255,255,255);" | Varies|style="background:rgb(255,255,255);" | [0x1F8B080000000000...] - Gzip header 2 and data
|-
|style="background:rgb(255,255,255);" colspan="3" align="center" | ...
