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. 2013 Dec 6;8(12):e81787. doi: 10.1371/journal.pone.0081787

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Lines show quantile regressions to convert neighborhood competition index (NCI) into an interval-specific estimate of log(canopy index) (NCI_ts, dashed line) or into a general estimate of log(canopy index) which is based on pooled data from both census intervals (NCI_tg, dotted line).