Hi Ferreters,
I found that in Ferret 6.3, lev=(lo,hi,delta) sometimes gives
a hi+delta contour:
$ ferret
NOAA/PMEL TMAP
FERRET v6.3
Linux(g77) 2.4.21-32 - 09/29/09
4-Nov-09 14:26
set mode grat:dash
keymark 1
yes? set data coads_climatology
yes? contour/hlimits=160:180/vlimits=40:60/lev=(3,3.9,0.1)/l=1 sst
In this example, the contour levels include 4.0 . On Ferret v6.2,
the maximum contour level is 3.9 .
My wild guess is that this is because "0.1" is actually 0.0999999
or so in single precision so that 3 + 0.1*9 < 3.9 . . . .
Regards,
Ryo