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Double D-spacing data that locate tie-lines: I (L30-R35 with αI=19.2°), II (L21-M25-R29 with αII=15.2°), III (L15-R20 with αIII=14.1°), IV (L5-R4.5 with αIV=−2°) and V (L0-R0 with αV=0). Solid lines are fits to the L data (solid symbols) and dotted lines are fits to the R data (open symbols).
