FINE VARIABLE time_ten_plots = 0.88

! This command evaluates the CPU time since the last 
! evaluation, which was just above.

yes? sh sym DELTA_CPU
DELTA_CPU = "0"

! To get elapsed time for a particular piece of calculation,
! set a variable or symbol containing one evaluation of CLOCK_SECS
! and subtract that from a later evaluation of CLOCK_SECS.

yes? let secs_0 = ($clock_secs)

yes? repeat/k=1:10 (shade/pal=rnb2 temp[L=@max])
yes? let elapsed_clock_time = `($clock_secs) - secs_0`

! SESSION_DATE and 