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(2) g*(10 k) = 10 S f(10 n).f[l0(n+k)] k=1,2...9 n (g* is directly estimated for abcissae lOxk ; when necessary it will be interpolated between some of these values). The results of algorithm (2) for the two sériés f^ and f | are plotted on fig. 1 and fig. 1' respectively : 1 000 . g*/10 968 first point nQ = 56 900 . 887s covariogram g* (data fj_) 800. 700 . : 704 600 . - 500 . - 400 . - 300 . - 200. - 100. - V. k/10 , ~"T -— 1 0 . 0 0 2 . 5 5.0 7.5 10.0 P Figure 1 first estimate of covariogram g(h)