DEFINE /LIKE

        [SIC\]DEFINE Type Var1 [Var2 [...]] /LIKE VarLike
        [SIC\]DEFINE IMAGE Var1 File1 Key1 [...]] /LIKE VarLike
        [SIC\]DEFINE STRUCTURE Struct1 [Struct2 [...]] /LIKE StructLike

    The  /LIKE option allows definition of Type REAL, LOGICAL, DOUBLE or IN-
    TEGER arrays with dimensions identical to those of the  (existing)  Var-
    Like  array.  IMAGEs and TABLEs can also be defined in this way. The di-
    mension field must not be specified in such a case.

    /LIKE can also be used in structure context: the new structure  will  be
    filled with a tree identical to the StructLike one (which can be a HEAD-
    ER or an IMAGE). However, the %DATA area of Structures and Images is ig-
    nored in this process, and should be defined separately if needed.

    The  /LIKE  option is incompatible with DEFINE FUNCTION, DEFINE COMMAND,
    as well as DEFINE HEADER and DEFINE FITS.