[Jmol-developers] bug in isosurface functionXY or in the example page

[Angel H. <ang...@ua...>]

I am investigating how to plot a mathematical function using 
isosurface functionXY .
I went to the page
http://chemapps.stolaf.edu/jmol/docs/examples-11/isosurface.htm
section #14, and the first red link gives an error:

(Jmol 11.5.44)

isosurface functionXY "curveAsArrayXY" {-5 -5 -5} {-11 1 0 0} {11 0 1 
0} {11 0 0 1}; ;
Exception null with nX, nY: 11 11
eval ERROR: el argumento no es válido
----line 1 command 9 of  file null:
         isosurface functionxy "curveAsArrayXY" { -5 -5 -5 } >> { << -
11 1 0 0 } { 11 0 1 0 } { 11 0 0 1 }

plus, I don't see if the first parameter in the tetrad is the number 
of points or voxels, how ti can be negative?