In a NUMBER@1 letter to Nature , PERSON@1 , PERSON@2 and PERSON@3 pointed out that their original article had said that `` more widespread high-resolution data are needed before more confident conclusions can be reached '' and that the uncertainties were `` the point of the article .

In a NUMBER@1 letter to Nature , PERSON@1 , PERSON@2 and PERSON@3 claimed the original article had said that they could not be exact .
