• The Option Set  will toggle between whether you get the line of singularities drawn as a sequence of dots or a set of dashes which link all these dots. Normally you will not see the difference between them unless you make a zoom.
  
• The integer input  will denote the number of unconditionally computed data points. As many points as you ask, the program will run slower but you will get greater exactitude. You may check a REDUCE/MAPLE manual for more information.
  
• The integer input  will define the maximum error that we are going to allow, understood as the negative exponent of a power of ten.
  
• The integer input  will denote the amount of memory (in kilobytes) that we are willing to allow the computer to use for this task.
  
• The button  will start the draw of the Greatest Common Factor in the Plot window. This may take a bit, even with a trivial Greatest Common Factor. So you must wait until you see the green line(s) drawn. For evaluation, P4 uses Maple/Reduce. You can view the output of Maple/Reduce in the Output window.
  

Note: It is not possible to remove the curve of singular points once it has been drawn.

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