I have tried plotting the admbase-maximum.asc but again getting the same results. I am attaching my gnuplot commands, maybe I am making some mistake here. KIndly have a look.
#set term png enhanced font "Vera,18" crop
set term postscript enhanced color #dashed
set size 0.6, 0.6
set xlabel 't'
set style line 1 lt 1 lw 3 pt 1
set style line 2 lt 2 lw 3 pt 2
set style line 3 lt 3 lw 3 pt 3
set style line 4 lt 4 lw 3 pt 4
set style line 5 lt 5 lw 3 pt 5
set style line 6 lt rgb "blue" #lw 0.1 pt 6
set style line 7 lt rgb "red" #lw 0.1 pt 6
set key left Left reverse
set yrange [:200]
set log y
set output "kasner.eps"
plot 'admbase-metric.norm2.asc' ev 5 u 2:3 w p ls 7 title "g_{xx} (numerical)",\
'admbase-metric.norm2.asc' ev 5 u 2:($2**(4.0/3.0)) w l ls 7 title "g_{xx} (exact)",\
'admbase-metric.norm2.asc' ev 5 u 2:8 w p ls 6 title "g_{zz} (numerical)",\
'admbase-metric.norm2.asc' ev 5 u 2:($2**(-2.0/3.0)) w l ls 6 title "g_{zz} (exact)"