<prompt> Translate the following text to EnglishMaelezo ya jopo la ukaguzi huru yalibainisha kuwa mchango mkubwa wa Mradi wa Uchambuzi wa HEI ni utambuzi kwamba vigezo vya uchafuzi na vifo vinaonekana kuwa vina uhusiano wa kijiografia katika seti ya data ya ACS.  <response>: Commentary by an independent review panel noted that a major contribution of the HEI Reanalysis Project is the recognition that both pollutant variables and mortality appear to be spatially correlated in the ACS data set. 