+const struct categoricals * covariance_get_categoricals (const struct covariance *cov);
+size_t covariance_dim (const struct covariance * cov);
+
+struct pivot_table *covariance_dump_enc_header (const struct covariance *);
+void covariance_dump_enc (const struct covariance *, const struct ccase *,
+ struct pivot_table *);
+