SITE(S) LINE N MEANDIF MEDIANDIF STDEVDIF NWR - cal LT 89 -0.004 -0.002 0.096 FEF - cal LT 84 -0.176 -0.163 0.119 SPL - cal LT 90 -0.181 -0.183 0.105 HDP - cal LT 89 0.956 0.971 0.236