tup.
...
FERRET_VERSION = "6.2"
FERRET_PLATFORM = "Linux(g77) 2.4.21-32"
SESSION_DATE = "14-May-09"
SESSION_TIME = "15:44"
DELTA_CPU = "0.01"
CLOCK_SECS = "2.62"
CURRENT_DATE = "14-May-09"
CURRENT_TIME = "15:52:17"
FERRET_MEMORY = "25.6"

yes? USE mydata.nc
yes? SHADE/K=1 temp[L=@ave]
yes? SHOW SYM DELTA_CPU, CLOCK_SECS
DELTA_CPU = "0.18"
CLOCK_SECS = "2.89"

yes? REPEAT/K=1:10 shade temp[L=@ave]

! DELTA_CPU since the evaluation just above on the SHOW SYM.
yes? LET time_ten_plots = ($DELTA_CPU) 
 !-&gt; DE