clabel (contour). Strange extra labels pops up.

[Birger Bech Jessen]

Octave 4.2.1.When plotting contourplot I get the relevant contours and their
labels.But in addition I get strange placed extra labels for one or two of
the contours, like the 
<http://octave.1599824.n4.nabble.com/file/t340440/Contour_clabel_error.jpg>
There are NO data explaining the multiple '40's and the single '30' labels.I
have tried several versions of commands like   [cs,h]=
contour(xi,yi,zi,IsoStep); clabel(cs,h,20:5:60,'fontsize',
13,'LabelSpacing',1500); (IsoStep is different number-series like
'20;30;40;50;60'   or  20:10:60   or  20;30;50;60 or .....note: The matlab
version clabel(c)  seems not to be implemented in Octave. Would give just
one label for each contour...Just now I use the fail plot, copy to a drawing
program and hide the 'fail labels'.. not smart...



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