[ncl-talk] emphasize every parts of a line with different colors according to its y value.

[grace]

Hi:
   All,I am trying to  draw a line  that emphasize every parts of it with different colors.
 I have found the example xy_12.ncl which highlight the wanted part by split the data.
 But I want to draw a line which have different colors according to its y numberical value,just like the plot below.
 
 If I split the data ,that would be a huge work.
 Have anybody drawed plot like this ?Any information will be appreciated.
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