[ncl-talk] Histogram using "gsn_csm_xy" res at gsnXYBarChartOutlineOnly = True

[Joowan Kim]

Dear NCL experts

I'm drawing histogram using, gsn_csm_xy.
It is very useful for me as it support drawing only outline of the
histogram, res at gsnXYBarChartOutlineOnly = True

But I found this option shifts the histogram half of dx (bin size).
Is it only my problem or designed like that on purpose?
I'm using ncl v6.2.0 in MacOS.

please see my testing example below
Any comment will be helpful for me!

Thanks

----------------------------
s = random_normal(0,3,2000)
r = True
r at bin_max =  5.
r at bin_min = -5.
y = pdfx(s,10,r)
x = y at bin_center

w = gsn_open_wks("eps","bar2")
o = True
o at gsnDraw  = False
o at gsnFrame = False
o at gsnXYBarChart = True
p1 = gsn_csm_xy(w,x,y,o)
o at gsnXYBarChartOutlineOnly = True
o at xyLineColor = "red"
p2 = gsn_csm_xy(w,x,y,o)
overlay(p1,p2)
draw(p1)
frame(w)

print("CAUTION: gsnXYBarChartOutlineOnly = True shifts the histogram...")
----------------------------


-- 
Joowan Kim
Atmospheric Chemistry Division
National Center for Atmospheric Research
PO Box 3000  Boulder, CO 80307
e-mail : joowan at ucar.edu
           joowan.k at gmail.com
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