The time history of acceleration of North-South component of the El-Centro, 1940 earthquake ground motion is given here at an interval of 0.02 sec. The unit of the acceleration is g. This is taken from the http://www.vibrationdata.com/elcentro.dat and are also given in the book by Professor A.K. Chopra (refer Chopra, 2001). This include 1559 data points to be read by row by row; the first value is at 0.02 sec and acceleration at time t=0 is zero. These data are also available NISEE website http://www.eerc.berkeley.edu.