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Probability 
to detect the target before dissociation as function of the target region length 
. Symbols: simulations using 500 different configurations with 50,000 runs for each. Lines: simplified theoretical model with a centred target (full lines) and a target at the boundary (dashed lines). Parameters (in units of 
): 
, 
, 
, 
. Colours: cyan (
), green (
), blue (
), black (
) and red (
).
