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Fig. 4.10 a NIR spectra of
16 kinds of linear
low-density polyethylene
(LLDPE) and one kind of
high-density polyethylene
(HDPE). b The second
derivative was calculated
with the Savitzky–Golay
method of the spectra in a.
c NIR spectra shown in
a after the MSC treatment.
Reproduced from Ref. [21]
with permission