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Average contour length of knotted arcs in linear DNA in slits (a) and channels (b) of effective transverse dimension Deff. In (c) and (b), the data of (a) and (b) are rescaled by 
for 
and by 
with ν = 0.585 for Deff. The main panels refer respectively to t = 0.62±0.05 while for the plot in the inset t = 0.74±0.01
