This is Fig. 9a from the paper, "Recent enhancements to PANDA2", by David Bushnell, AIAA 37th Structures, Structural Dynamics, and Materials Conference, Salt Lake City, UT, 1996, pp. 126-182, called "1996 enhance paper" in some other slides.
This slide shows:
(a) the original truss-core cross-section geometry;
(b) New alternative geometry permitted in PANDA2.
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