function checkRTDHistory ( )
 xxx = load ( 'RTDhistory_2011-10-01-000001_2011-10-05-000001.mat' );

result = xxx.result;
 girder = 1;
 for RTD = [ 3, 6, 9 ] % [ upstream, center, downstream ]
       j      = ( girder - 1 ) * 12 + RTD;
       plot ( (result.time{j} - result.time{j}(1)) * 24., result.readings{j}, '-r' );
      hold on;

       for k = 131 : 160
           fprintf ( '%s %s %6.3f\n', result.RTDPVs {j}, datestr ( result.time{j}(k), 'yyyy-mm-dd HH:MM:SS' ), result.readings{j}(k) );
       end
 end
 hold off;
 end
