Pretty sure he meant 1.5.1. Found the documentation for the program he's using here: http://www.hpcu.uq.edu.au/Manuals/MSC/msc/docs/marc/python/python_manual.pdf It looks like the PyTensor object *should* have .xx, .xy, etc properties, but they may be accessible through a matrix, i.e. .t(i,j)