Hello Nisa Amir,
I have tried everything but again getting the same results. A day before Erick schentter send me an asc file they have used for plotting the figure. their value of gxx is growing slowly but in my file it grows rapidly. Attaching both files. is there something to do with the values of parameters p1 and p2?
I would not be able to tell. However I (finally) gave this a try see a similar very rapid growth in gxx (much more rapid than the growth in the paper). I will try and see if I can find out which version of the Einstein Toolkit first shows this behaviour.
Yours, Roland