set xlabel "time [us]"
set ylabel "(C_e)/({/Symbol D}p/p) [ppm]"

f = 2/3.e8/1.45*1.e6

#set key noenhance
#plot 'BetaCrossE_turn.dat' u ($8*1.e6):($10/$12)*f w l 

set ylabel "C_e [ppm]"
pause -1
set autoscale y
plot 'BetaCrossE_turn.dat' u ($8*1.e6):($10/$12*$7)*f w l