Well, without rigs the base value for the Tatara is 51% as 2% is also a multiplicative factor (0.5x1.02 = 0.51) - same as for other modifiers for reprocessing. Similar for the Tatara: 52% base, if no rigs are installed (0.5x1.04 = 0.52).
The Athanor with T2 rigs in high sec should end up at 54.06% (displayed in the client is 54%), which matches the information from Verite Rendition.
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