How to use aave with time-interval

[Wang Lizhi]

Hi, everyone,

I get the ncep2 data set(example flx.ft06.200909), and I can plot a region's average
temperature curve use following:

open flx.ft06.200909.ctl
set t 1 120
define v=aave( tmp2m, lon=110,lon=120,lat=20,lat=30)
set x 1
set y 1
set z 1
d v

But the curve is plotted at interval 6hour. Now I want to plot the mean daily
temperature curve, How can I do ?

thanks