Fig. 7. Cross-correlograms between (a and c) eggs per cyst [log₁₀(eggs per cyst + 1)] in 1999 and cysts [log₁₀(cysts 100 cm^-3 soil + 1)] in 2000 and (b and d) eggs [log₁₀(eggs 100 cm^-3 soil + 1)] in 1999 and cysts in 2000 in (a and b) Field A and (c and d) Field B. r = linear correlation coefficient.