Does anyone have a good explanation of the difference between T-gate verse H-gate FETs and why you might want to use one over the other?

See e.g. https://ieeexplore.ieee.org/document/1416935

As I was struggling with what an H- and T-gate actually looks like (I am no expert in SOI), in this paper, there are drawings (sorry for the paywall): https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=1386411