Where can I map the translate values of the tranformation matrix in a document?

Hi All,

I have been looking into the transformation matrix of InDesign for a day now. Had great help from http://www.indiscripts.com/blog/public/data/coordinate-spaces-and-transformations-1/Coordi nateSpacesTransfos01_KeyConcep…

I am executing the following script to get the transformation matrix of a page-item.

var pageItem = app.activeDocument.pageItems.item(0);
mx = pageItem.transformValuesOf(CoordinateSpaces.parentCoordinates)[0];
alert( mx.matrixValues );

Now on executing the above I am able to understand how the 'a', 'b', 'c', 'd' values are calculated. But I do not have an understanding on the 'e', 'f' values that represent the horizontal and vertical translations respectively.

Can anyone tell me what these values represent on the InDesign document?

Thanks!