I think there is bug in "DrawPanel":
Try the following:
(1) run "hsimple" to produce a histogram
(2) click on the curve to get the DrawPanel for "hpx"
(3) use the slider to select a region
(4) click on the curve once more to get "FitPanel"
(5) do a gaussian fit for example
(6) click on the fitted curve to get a DrawPanel again
(7) the above DrawPanel (2) will then be reassigned to "gauss"
(8) trying to use the slider causes "segment violation"
(9) the original histogram "hpx" vanishes
It seems that some "hpx" defs are left in the DrawPanel when it is reused
for the "gauss" curve.
Rudi.
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