2D dataset

  ICL> TXT2AST test.dat output
    TOPLEVEL TITLE "Test" TYPE "Image" LABEL ~  ; Continuation
      "Flux" +                                  ; And another one
       UNITS "mJy"
    ;
    AXIS LABEL "X_COORD" UNITS "femto-parsecs"  ; 1st axis
    AXIS UNITS "miles" LABEL "Y_COORD"          ; 2nd axis
    DATA                                        ; data array
    *
    2 2 7    ; Note data values are jumbled - TXT2AST still places
    1 2 4    ; them correctly.
    3 3 45
    1 1 3
    2 3 8
    3 1 4
    1 3 5
    3 2 10
    2 1 6
  

   .TITLE                         "Test"
   .TYPE                          "Image"
   .AXIS[2]
      .AXIS(1)
         .LABEL                   "X_COORD"
         .UNITS                   "femto_parsecs"
         .DATA_ARRAY[3]           1.0, 2.0, 3.0
      .AXIS(2)
         .LABEL                   "Y_COORD"
         .UNITS                   "miles"
         .DATA_ARRAY[3]           1.0, 2.0, 3.0
   .DATA_ARRAY[3,3]                3  6  4
                                   4  7 10
                                   5  8 45
   .HISTORY