carried out:
./addhead.sh rtm_step10_lap.dat rtm_step10_lap.su (where rtm_step10_lap.dat is input data, input to $1, output is: rtm_step10_lap.su)
carried out:
./addhead.sh rtm_step10_lap.dat rtm_step10_lap.su (where rtm_step10_lap.dat is input data, input to $1, output is: rtm_step10_lap.su)