trix with respect to
   PARAM(DIFF) if DIFF~= -1, or the covariance matrix itself if DIFF is
   equal to -1 (in which case this is equivalent to stk_materncov_aniso
   (PARAM, X, Y)).

 CALL: K = stk_materncov52_aniso (PARAM, X, Y, DIFF, PAIRWISE)

   computes the covariance vector (or a derivative of it if DIFF > 0)
   between the sets of locations X and Y. The output K is a vector of
   length N, where N is the common number of rows of X and Y.
</pre>

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