/COMPRESSION_MAP [=m [:n[:p[{:|;}q]]] ]

    In a compressed dump, displays details of the compression data.
    You can specify levels of detail by using the following syntax,
    where m,n,p,q may each be wildcarded (*):

    no value   Displays a summary of all compression map blocks.
    m          Displays contents of a single compression map block.
    m:n        Displays details of single compression map entry.
    m:n:p      Displays compressed and raw data for the specified
               compression section (item p in section m:n). Note that
               m:n:p may contain wildcards (*).
    m:n:p:q    Displays compressed and raw data for the specified
               range of compression sections (items p to q inclusive
               in section m:n).
    m:n:p;q    Displays compressed and raw data for the specified
               range of compression sections (q items starting from
               item p in section m:n)
 .