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!! +var+ +exec+ +string+
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!! +var+ +exec+ +string+
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tit:leveldata
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$lst_tit leveldata$lst_titend$type_both
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type:$type_both
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  $lst_alias levelpoints
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alias:!levelpoints
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  $(lst_syntax)leveldata size $emph xsize,ysize$emphend
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  ranges $emph x1,x2,y1,y2$emphend function $emph f(x,y)$emphend
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syntax:!leveldata size `xsize,ysize' ranges `x1,x2,y1,y2' function `f(x,y)' [levels `l1,l2,...']
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  [levels $emph l1,l2,...$emphend]</span>
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  $lst_mean Computes coordinates of points on the level curve of
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mean:Computes coordinates of points on the level curve of `f(x,y)', at levels `l1,l2,...'\
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  $emph f(x,y)$emphend, at levels $emph l1,l2,...$emphend (defaults to one
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  level 0). <p>
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 (defaults to one level 0). <p>\
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  The computation is made from $emph (x1,y1)$emphend to
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  The computation is made from `(x1,y1)' to `(x2,y2)', and points are computed as integer\
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  $emph (x2,y2)$emphend, and points are computed as integer positions in a
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  picture with size $emph xsize,ysize$emphend. </p><p>
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  positions in a picture with size `xsize,ysize'. </p><p>\
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  Order of the fields is not important. All the fields except levels are
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  Order of the fields is not important. All the fields except levels are mandatory.\
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  mandatory.
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  </p>
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  </p>