Fig. 4. Semivariograms of (a and b) cysts [log₁₀(cysts 100 cm^-3 soil + 1)], (c and d) eggs per cyst [log₁₀(eggs per cyst + 1)], and (e and f) eggs [log₁₀(eggs 100 cm^-3 soil + 1)] from Field B in (a, c, and e) 1999 and (b, d, and f) 2000. Black circles indicate omnidirectional empirical semivariogram, the solid line indicates the theoretical model fitted by means of least squares, and the dashed line is the sample variance.