errors when using rgb color map

Hi,
   I defined some colors using rgb triplets in ncl script, but the fourth color( Bleu de France RGB:R97,G184,B255) missed and gray color appeared automatically at the end.
   I think the number of colors and cnLevels is matched ,but why I got wrong image? Could you please tell me how to modify my script.
   Attachment is my ncl script and the related images.
   Thanks a lot!!

    Yuhua

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