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[ferret_users] lev=20VC not centered?

Hi Ansley and Ferret team,

This might be another problem:

  $ ferret
          NOAA/PMEL TMAP
          FERRET v6.3
          Linux(g77) 2.4.21-32 - 09/29/09
           6-Oct-09 13:12
  yes? set data coads_climatology
  yes? palette centered
  yes? fill/lev=20vc/l=1 uwnd
  yes? fill/lev=vc/l=1 uwnd

The palette "centered" has a sharp transition
from green to yellow at the center (50%).  With "lev=vc",
the zero level indeed coincides with the green-yellow
transition, but with "lev=20vc", the color levels are no
longer centered and the green-yellow transition does not
come to the zero level (In the example above, it falls
on the value 1 m/s).

Hope this helps,

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