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stratochief66's post in Mars mission planning, eccentric orbits at Mars was marked as the answer
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20150009466.pdf
See FIgure 6, 'Butterfly Orbit"
I saw something like the above with more detail in a printed book that chronicled past Mars missions and contained a bunch of documentation from studied crewed Mars missions, but I can't link that obviously.