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Typical force-distance (F-D) curves of polyacrylamide (PAM) thin layer surfaces (426 nm) irradiated with a different number of laser pulses (lp) (250 J m−2 per laser pulse): (a) F-D curves of the non-irradiated layer; (b) F-D curves with 200 lp; (c) F-D curves with 300 lp; (d) F-D curves with 400 lp.
