diff --git a/JET/rda_eff.m b/JET/rda_eff.m
index f0c13b85ad467514e204e640017631b7aaf7a678..b1bb601bce43cee0451135fbabfdc13fc98a86fd 100644
--- a/JET/rda_eff.m
+++ b/JET/rda_eff.m
@@ -133,7 +133,7 @@ if usemdsplus
       iblock=str2num(maintrace(ichannel+3));
       mdsdisconnect;
       mdsconnect('mdsplus.jet.efda.org');
-      taaa=40+(iblock-1)*8;
+      taaa=39.9989+(iblock-1)*8;
       time=linspace(taaa,taaa+8-4e-6,length(data))';
     end
   case 2