dataFiveTh = Import["/Users/oleg/log/csv/MainLogFiveThousand.csv"];
dataFiveSq = Import["/Users/oleg/log/csv/MainLogFiveSquare.csv"];
dataSixTh = Import ["/Users/oleg/log/csv/MainLogSixThousand.csv"];
dataSixSq  = Import["/Users/oleg/log/csv/MainLogSixSquare.csv"];

f = Function[{u}, {u[[2]], u[[1]]/10^9}];

dataFTN = f /@ dataFiveTh;
dataFSN = f /@ dataFiveSq;
dataSTN = f/@ dataSixTh;
dataSSN = f /@ dataSixSq;

ListLinePlot[dataFTN]
ListLinePlot[dataFSN]
ListLinePlot[dataSTN]
ListLinePlot[dataSSN]