SITE(S) LINE N MEANDIF MEDIANDIF STDEVDIF NWR - cal LT 86 0.040 0.040 0.141 FEF - cal LT 83 -0.197 -0.181 0.088 SPL - cal LT 84 -0.107 -0.117 0.086 HDP - cal LT 90 -0.187 -0.163 0.116