Time series of the (a) raw tree-ring width chronology and (b) tree-ring standard chronology (STD) and the sample size from <i>Pinus massoniana</i> of the Niumulin Nature Reserve (NML) for the period of 1836–2013.
<p>The reliable period of the chronology with over 13 cores is determined with the static of Expression Population Signal (EPS) greater than 0.85. The red lines represent the result of FFT filtering using a 10-year window to emphasize the low-frequency variations.</p
