todo: get data from
	~/dat/mr/ge-3t/2010-07-06-fessler-3d/slice38/ramani

al-p2 is here:
https://github.com/JeffFessler/mirt/tree/main/contrib/ramani
https://github.com/JeffFessler/mirt

and here:
https://web.eecs.umich.edu/~fessler/irt/irt/contrib/ramani
https://web.eecs.umich.edu/~fessler/code/index.html

locally the m-files are in
	~/src/matlab/alg/contrib/ramani/al-p2