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Plot of the ratio ΔA/ΔPh versus contour length 
of straight DNA molecules; 
values are calculated for each length 
from Eq. 6. The straight line (inset) is a linear fit (R = 0.997) of the data. Also indicated, as boxes on the y axis, are the various cases of formed layer rigidity (see text). The y axis is equivalent to 
or [η] (see Model Analysis).
