Is there a way to mark specific tick points on x, y and z axes? 
 
Also, I'm trying to overlay a persp plot using the command lines(..) but it doesn't appear to work, does anyone know why?
 
I'm also trying to rotate the persp plot using rotation but this doesn't work either? I get the error
 
parameter "rotation" couldn't be set in high-level plot() function 
 
does anyone know why?
 
Thanks for any help.



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