Comparison of predictions from different calculation pathways. Pseudotsuga menziesii prediction envelopes for a component derived from different sets of equations often overlap considerably. Shown here is the overlap of aboveground carbon between 10- and 30-cm diameter at breast height (DBH) classes under approach 2 with positive correlation. This DBH range allows better visualization of envelope overlap than the full 3-66 cm range used in the analysis. Numbers on the right correspond to the numbered aboveground total prediction envelopes from calculation pathways in Figure 6.