Figure 7: Calculated gap size distribution in the black spruce stand at three solar zenith angle:
(a) between tre crown and (b) inside tree crowns. For the distributions between tree crowns,
(47) is used with L_t and W_t from (41) and (42), respectively. For the distribution inside tree crowns,
L_t and W_t are replaced by L_s and W_s, respectively, where Ls is calculated from (45)
and W_s is taken to 35 mm.