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Integer_Type chips_set_zscale(scale) 
      
	Sets the scale of the plot's z-axis.  
       Arguments for chips_set_zscale
          | scale | Numeric | 0, 1, "linear", "log", _chips->log, _chips->linear | logarithm is base 10 |  
	  When invoked with no argument, the function will reset the
	  scale to linear.
	 
        The function returns a 0 on success and -1 on failure.
       
	The current scale may be found with chips_get_zscale.
       
	
  chips> chips_set_zscale("log")    
  0
	
	The z-axis for a plot is changed to log scale.  Equivalent
	commands are:
	 
  chips> chips_set_zscale(0)
  chips> chips_set_zscale(_chips->log)
	 
	
  chips> chips_set_zscale(0)
  0
  chips> chips_set_zscale(_chips->linear)
  0
	
	First, the z-axis is set to logarithmic scale.  The second
	"chips_set_zscale" command changes it back to a linear scale;
	equivalent commands are:
	 
  chips> chips_set_zscale(1)
  chips> chips_set_zscale("linear")
  chips> chips_set_zscale()
	 
chips
chips_auto_redraw,
chips_clear,
chips_color_name,
chips_color_value,
chips_get_pane,
chips_get_xrange,
chips_get_xscale,
chips_get_yrange,
chips_get_yscale,
chips_get_zrange,
chips_get_zscale,
chips_label,
chips_line,
chips_pickpoints,
chips_redraw,
chips_set_pane,
chips_set_xrange,
chips_set_xscale,
chips_set_yrange,
chips_set_yscale,
chips_set_zrange,
chips_split,
chips_version
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