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Fig. 3. Scaling of bell geometry with bell height. Shoulder height (hs/h) and fineness (r0/h) ratios are plotted on the left-hand vertical axis, while the wall thickness ratio ({tau}/h) is plotted on the right-hand axis. Shoulder height and fineness ratios decrease with increasing bell height. The slopes of both lines were significantly different from zero (P<0.05 for both). The wall thickness ratio did not scale with bell height.