The format is:
List of 2
$ : num [1:600, 1:76] 0.0659 0.0491 0.0342 0.0623 0.062 ...
..- attr(*, "dimnames")=List of 2
.. ..$ : chr [1:600] "V1" "V2" "V3" "V4" ...
.. ..$ : NULL
$ : int [1:600, 1:240] 0 0 0 0 0 0 0 0 0 0 ...
..- attr(*, "dimnames")=List of 2
.. ..$ : chr [1:600] "V1" "V2" "V3" "V4" ...
.. ..$ : NULL