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Fig.3 Polarizing optical microscopy images of profiled PAN fibers at different temperatures and under different irradiation doses Irradiation dose/kGy: (A1—A5) 0; (B1—B4) 200; (C1—C4) 250; (D1—D4) 300; (E1—E4) 350. Temperature/℃: (A1—E1) r.t.; (A2—E2) 220; (A3—E3) 250; (A4—E4) 270; (A5) 290.