<div dir="ltr"><div>HI Tao,</div><div><br></div><div>Apologies for the delay in response. I started to look into this, but do not have an answer and I got busy elsewhere. I still don't have an answer, nor more importantly a fix or work-around. I speculate it has to do with where and how the stipple pattern is mapped to the page, and that slightly adjusting the positioning of the maps would reveal other differences. <br></div><div><br></div><div>You might consider using a solid-fill color that is very nearly transparent, rather that a stipple pattern.</div><div><br></div><div>Hope that helps...</div><div>Rick</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 1, 2019 at 12:53 PM Tao Zhang <<a href="mailto:tao.zhang@noaa.gov">tao.zhang@noaa.gov</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
<br>
When I use NCL to plot significance area, the same data can get <br>
different dots (see Northern Montana for example)<br>
<br>
when they are plotted in top or bottom.<br>
<br>
see below for key sentences and attached plot.<br>
Any comments?<br>
<br>
Thanks,<br>
<br>
Tao<br>
<br>
<br>
;;;;;;;;;;;;;;;;;;;;;;;<br>
res@vpHeightF = 0.40<br>
res@vpWidthF = 0.70<br>
<br>
res@vpXF = 0.107192<br>
;res@vpYF = 0.917978<br>
res@vpYF = 0.957978<br>
<br>
;res@gsnCenterStringFontHeightF = 0.03<br>
;res@gsnCenterString= "T2m, EP El Nino"<br>
plots(0) = gsn_csm_contour_map(wks, diff_tref, res )<br>
abc = gsn_csm_contour(wks,sigt2mnew,restip) ;make dots plot<br>
overlay(plots(0),abc)<br>
delete(abc)<br>
<br>
draw(plots(0))<br>
<br>
;<br>
res@vpHeightF = 0.40<br>
res@vpWidthF = 0.70<br>
<br>
res@vpXF = 0.107192<br>
res@vpYF = 0.544645<br>
<br>
;res@gsnCenterString= "T2m, CP El Nino"<br>
plots(2) = gsn_csm_contour_map(wks, diff_tref, res )<br>
abc = gsn_csm_contour(wks,sigt2mnew,restip) ;make dots plot<br>
overlay(plots(2),abc)<br>
delete(abc)<br>
<br>
draw(plots(2))<br>
;<br>
<br>
<br>
<br>
--------------<br>
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</blockquote></div>