[ncl-talk] small issues with the plot

[Geeta Geeta]

Hi . 
I have 2-3 issues with my plots. I am plotting 3 variables in one plot which are divergence, Q and then wind vectors. I am using overlay function. Each plot corresponds to one Level (total 7 levels) and 4 times. so there should be 28 plots. and I am making panel plot after that.  ie for one level, 4 plots of time. 
the issues are 
(a) My script is generating each plot but overwriting and finally I am left with plots of only one level. 
(b) I am having difficulty adjusting the countour levels of two variables 

One is shaded contour and other is without shading. 

res at cnLevels              =  fspan(-2,2,10) ON the Line 152.  is the resource for 1st variable Divergence. 

; resq at cnLevelSelectionMode  =  "ExplicitLevels"    for 2nd variable. 
; resq at cnLevels              =  ispan(4,20,4)
If I use both then I get error.  

without this setting, the plots are not uniform. 

(c) warning:_NhlGetGksCi:Invalid Color index=-1222527888 
is also 

Geeta.